My Crock Pot Pepper Steak is one of the most requested dinners in my house for a very specific reason: I can assemble it in 10 minutes in the morning, walk away for 6 to 7 hours, and come home to a kitchen filled with the smell of slow-cooked beef and bell peppers and a dinner that is completely ready. The beef comes out fork-tender after the long, gentle cook. The bell peppers soften beautifully while still holding some structure. And the sauce — made from soy sauce, beef broth, Worcestershire, brown sugar, garlic, and a touch of cornstarch for thickness — is deeply savory, slightly sweet, and coats every piece of steak and vegetable in a glossy, restaurant-quality glaze.
The optional searing step at the beginning is the detail that most slow cooker recipes skip — and skipping it is a real loss. Two to three minutes of high-heat searing on the sliced steak before it goes into the crock pot creates a Maillard reaction on the surface of the meat that produces flavor compounds that slow cooking alone cannot create. The browned bits that stick to the pan get scraped into the sauce and add a depth and richness that you can taste in every bite of the finished dish. It adds 5 minutes to the prep and makes a noticeable difference.
I serve this over steamed rice or egg noodles for a complete dinner, or over mashed potatoes when I want something especially comforting. Leftovers taste even better the next day — the sauce concentrates and deepens as it sits overnight. For more slow cooker meals, see my Crock Pot Crack Potato Soup and my 25 Easy Crockpot Chicken Recipes.
10 minutes to assemble, 6 to 7 hours hands-off. Let me show you how.
WHY YOU WILL LOVE THIS RECIPE
- Set It and Forget It — Genuinely: Unlike some slow cooker recipes that require checking, stirring, or adding ingredients mid-cook, this recipe requires nothing after you put the lid on. You assemble everything in the morning — beef, peppers, onions, sauce — add the lid, and walk away. Six to seven hours later, dinner is ready. This is the recipe I make on days when I know the evening will be too busy to cook.
- The Beef Becomes Fork-Tender: Low, slow cooking breaks down the tough connective tissue in beef in a way that high-heat cooking cannot. After 6 to 7 hours on low, even a moderately inexpensive cut like flank or sirloin becomes genuinely tender — the fibers relax and the meat pulls apart easily. This is one of the most satisfying textural outcomes in all of slow cooking, and it is impossible to achieve through any other method in this timeframe.
- The Sauce Is the Best Part: Soy sauce, beef broth, Worcestershire sauce, brown sugar, garlic, and cornstarch combine into a sauce that is simultaneously savory, slightly sweet, tangy, and deeply umami. After hours of slow cooking with the beef and vegetables, the sauce absorbs the flavor of everything in the pot and becomes something more complex than its individual components suggest. Served over rice or noodles, the sauce is what everyone reaches for more of.
- Leftovers Are Even Better the Next Day: I deliberately make a large batch of this recipe specifically so we have leftovers. After a night in the refrigerator, the sauce concentrates and deepens, the beef absorbs even more flavor, and the peppers soften to a silkier texture. Leftover pepper steak reheated over fresh rice the next day is a lunch I genuinely look forward to.
- Works with Multiple Beef Cuts: Flank steak is my preference — it slices thinly and becomes very tender after the long cook. Sirloin is slightly more expensive but produces a richer result. Chuck steak is the most economical option and works very well in slow cooking because the higher connective tissue content breaks down into body and gelatin in the sauce. Even round steak, which is notoriously tough when cooked quickly, becomes tender after 6 to 7 hours in the crock pot.
- Meal-Prep Friendly: This recipe is one of the best meal-prep dinners I know. It makes 4 generous servings, reheats perfectly, and tastes better on day two. I often make a double batch on Sunday and portion into containers for weekday lunches — each portion over fresh rice reheats in 2 minutes and tastes like a proper meal. For more meal prep ideas, see my Weekly Meal Prep Guide.
INGREDIENTS
- 1 ½ lbs flank steak or sirloin steak, thinly sliced against the grain (slicing against the grain shortens the muscle fibers and is the single most important factor in achieving tender beef)
- 1 tablespoon olive oil (for optional searing)
- 1 large onion, sliced
- 1 large red bell pepper, sliced
- 1 large green bell pepper, sliced
- 2 cloves garlic, minced
- ¼ cup soy sauce (use reduced-sodium if you prefer less salt)
- ¼ cup beef broth
- 2 tablespoons Worcestershire sauce
- 1 tablespoon brown sugar
- 1 tablespoon cornstarch (mixed with 2 tablespoons cold water for a slurry to thicken at the end)
- ½ teaspoon black pepper
- ½ teaspoon crushed red pepper flakes, optional
- 1 teaspoon sesame oil, optional (adds an aromatic depth at the end)
DIRECTIONS
- Step No.1: Optional Sear the Steak. Heat the olive oil in a large skillet over high heat until shimmering and very hot. Add the sliced steak in a single layer — work in batches if needed; do not crowd the pan — and sear for 2 to 3 minutes without moving. You want a golden-brown crust on the surface, not steaming grey meat. Flip once and sear the other side for 1 minute. Transfer to the crock pot. This step is optional but adds measurable flavor depth to the finished dish.
- Step No.2: Add the Vegetables. Place the sliced onions, red bell pepper, green bell pepper, and minced garlic into the crock pot on top of the steak. If you completed the searing step, add any browned bits and pan drippings from the skillet into the crock pot — these contain concentrated flavor.
- Step No.3: Make and Pour the Sauce. In a small bowl, whisk together the soy sauce, beef broth, Worcestershire sauce, brown sugar, black pepper, and red pepper flakes (if using). Pour the sauce evenly over the beef and vegetables in the crock pot. Stir everything gently so the sauce is distributed and all the ingredients are coated.
- Step No.4: Slow Cook. Cover the crock pot and cook on low for 6 to 8 hours or on high for 3 to 4 hours. The steak should be fork-tender and the peppers soft but still holding their shape. The cooking liquid will have deepened in color and reduced slightly.
- Step No.5: Thicken the Sauce. If the sauce needs thickening, switch the crock pot to high. Mix 1 tablespoon of cornstarch with 2 tablespoons of cold water in a small bowl to form a smooth slurry. Stir the slurry into the crock pot and cook on high for an additional 15 to 20 minutes, stirring once or twice, until the sauce reaches a glossy, coating consistency.
- Step No.6: Finish and Serve. Stir in the sesame oil if using — just ½ teaspoon adds a beautiful aromatic note that elevates the whole dish. Taste and adjust seasoning if needed. Serve hot over steamed rice, egg noodles, or mashed potatoes, garnished with fresh parsley or sliced green onions.
TIPS FOR SUCCESS
- Always Slice Against the Grain: The single most important preparation step for any beef slow cooker recipe. Slicing against the grain means cutting perpendicular to the direction the muscle fibers run, which shortens them and produces tender slices. Slicing with the grain leaves long, intact fibers that produce chewy, stringy meat regardless of how long it cooks. Look at the steak, identify which direction the fibers run, and cut across them at a 90-degree angle.
- Do Not Skip the Searing Step: I know I listed it as optional, but if you have 5 extra minutes in the morning, sear the beef. The Maillard reaction that occurs during high-heat searing produces flavor compounds — complex, savory, slightly caramelized — that slow cooking cannot replicate. The browned surface of the meat adds a richness and depth to the finished sauce that makes the entire dish noticeably more flavorful. Try it both ways once and decide for yourself.
- Thin Slices Cook More Evenly: Aim for strips about ¼-inch thick. Thicker pieces take longer to become tender and may still be slightly firm after the full cook time. Thinner strips cook evenly through the full duration and absorb more sauce into the meat. Partially freezing the steak for 20 to 30 minutes before slicing makes it significantly easier to cut thin, even strips.
- Adjust the Sauce to Your Taste Before Cooking: Taste the raw sauce mixture before pouring it over the beef and vegetables. If you prefer a sweeter sauce, add another teaspoon of brown sugar. If you want more depth, add a dash more Worcestershire. If you like more umami, add a small splash of soy sauce. The sauce cooks for 6 to 7 hours with the beef and becomes more concentrated and complex — adjusting it raw is much easier than correcting it after cooking.
- Add the Cornstarch Slurry Toward the End: Adding cornstarch at the beginning of cooking is ineffective — it breaks down over the long cook time and the sauce will be thin despite it. Add the cornstarch slurry in the final 15 to 20 minutes, on high heat, and stir once or twice. The sauce will thicken to a glossy, coating consistency that clings to the beef and vegetables beautifully.
- Cook on Low for Best Results: The low setting (usually around 200°F) produces more tender beef and a more complex, slowly developed flavor than the high setting. High heat works if you are short on time — 3 to 4 hours on high produces good results — but 6 to 7 hours on low is where the beef becomes truly fork-tender and the sauce deepens into something genuinely special.
VARIATIONS
- Spicy Pepper Steak: Add 1 tablespoon of chili garlic sauce or Sriracha to the sauce mixture, and double the crushed red pepper flakes. The heat from the chilli adds a pleasant burn that plays well against the savory, slightly sweet sauce. A chopped jalapeño added with the vegetables creates additional heat with a fresh pepper flavor.
- Add Mushrooms: Slice 1 cup of cremini or button mushrooms and add them to the crock pot with the bell peppers. The mushrooms absorb the savory sauce beautifully and add an earthy depth that makes the dish feel more substantial. They also bulk up the recipe without significantly increasing cost.
- Sweet and Savory Version: Add a small handful of pineapple chunks in the last 30 minutes of cooking. The pineapple adds natural sweetness and a slight acidity that balances the soy sauce and Worcestershire beautifully. This is a popular variation in Filipino-inspired cooking and creates a noticeably different, more tropical-flavored version of the dish.
- Gluten-Free Version: Substitute tamari or coconut aminos for the soy sauce — both are naturally gluten-free and produce a very similar flavor profile. Check that your Worcestershire sauce is also gluten-free (most brands are but a few are not). All other ingredients in the recipe are naturally gluten-free.
SERVING AND STORAGE
Serving
Serve hot over steamed white rice, egg noodles, or mashed potatoes, garnished with fresh parsley or sliced green onions. The sauce is what makes this dish — serve generous amounts of it over whichever base you choose. Pair with a simple steamed vegetable or a green salad to round out the meal. For a full slow cooker dinner lineup, see my Crockpot Ham, Green Beans and Potatoes.
Storage
Store leftovers in an airtight container in the refrigerator for up to 3 to 4 days — the flavor actually improves overnight as the beef continues to absorb the sauce. Reheat gently on the stovetop or in the microwave, adding a small splash of beef broth if the sauce has thickened too much. To freeze, cool completely, transfer to a freezer-safe container, and freeze for up to 3 months. Thaw overnight in the refrigerator and reheat as directed.
Yes — flank and sirloin are my preferences because they slice well and become very tender after slow cooking, but several other cuts work excellently. Chuck steak is the most economical option and produces an incredibly rich, gelatinous sauce from the connective tissue that breaks down during cooking. Round steak works well despite being notoriously tough when cooked quickly — the slow cooker gives it the time it needs. Ribeye produces the richest, most flavorful result but is the most expensive option. Avoid very lean cuts like tenderloin, which can become dry rather than tender in the slow cooker.
Yes — this is one of the best recipes for advance preparation. The flavors genuinely improve after a night in the refrigerator as the beef absorbs more sauce. You can cook the full recipe, cool it completely, refrigerate for up to 3 days, and reheat gently before serving. You can also assemble all the raw ingredients in the crock pot insert the night before, refrigerate overnight, and simply place the insert in the cooker base and switch on in the morning — reducing morning prep to virtually nothing.
Yes — this recipe freezes very well. Cool completely to room temperature before transferring to freezer-safe containers or bags. Freeze for up to 3 months. Thaw overnight in the refrigerator, then reheat on the stovetop over medium-low heat, adding a splash of beef broth if the sauce has become very thick. The texture of the beef holds up well through freezing since the slow cooking has already broken down the fibers extensively.
Yes — several options. Add more crushed red pepper flakes to the sauce mixture before cooking. Add a chopped jalapeño or serrano chilli with the bell peppers. Stir in a tablespoon of chili garlic sauce or Sriracha at the end of cooking. Add ½ teaspoon of cayenne pepper to the sauce. Any of these creates a noticeably spicier result — start with the smallest amount and adjust to your tolerance since slow cooking concentrates flavors and can intensify the heat over time.
Steamed white rice is the most popular accompaniment — it absorbs the sauce beautifully and makes a complete, satisfying meal. Egg noodles are a close second and give the dish a more American Chinese restaurant quality. Mashed potatoes are a more comfort-food-forward option that works very well with the rich sauce. For a lower-carb alternative, cauliflower rice or steamed broccoli both pair well. Whatever base you choose, be generous with the sauce — it is the best part of the dish.
This Crock Pot Pepper Steak is the slow cooker recipe I recommend to anyone who is skeptical about whether slow cooker meals can actually taste restaurant-quality. The searing step, the carefully balanced sauce, and the long, gentle cook time produce a result that is genuinely impressive — tender, deeply flavored, and satisfying in every bite.
Leave a comment and let me know what you served it over and which variation you tried! For more hearty slow cooker dinners, see my Crockpot Mississippi Chicken, my Crockpot Ranch Pork Chops, and my Lasagna Soup. 🥩🫑
CROCK POT PEPPER STEAK
Ingredients
- 1 ½ lbs flank steak or sirloin thinly sliced
- 1 green bell pepper sliced
- 1 red bell pepper sliced
- 1 large onion sliced
- 2 cloves garlic minced
- ¼ cup soy sauce
- ¼ cup beef broth
- 2 tablespoon Worcestershire sauce
- 1 tablespoon brown sugar
- 1 tablespoon cornstarch optional for thickening
- ½ teaspoon black pepper
- 1 teaspoon sesame oil optional
- 1 tablespoon olive oil for browning the beef, optional
Instructions
- If desired, brown the sliced beef in a skillet with olive oil over medium-high heat for 2-3 minutes to enhance flavor. This step is optional but adds richness.
- Add the sliced beef, bell peppers, onion, and minced garlic to the Crock Pot.
- In a small bowl, whisk together soy sauce, beef broth, Worcestershire sauce, brown sugar, and black pepper.
- Pour the sauce over the beef and vegetables in the Crock Pot, stirring to combine.
- Cover and cook on low for 6-8 hours, or until the beef is tender and the flavors are well blended.
- If you prefer a thicker sauce, mix 1 tablespoon of cornstarch with 2 tablespoons of water and stir it into the sauce about 30 minutes before serving.
- Serve the pepper steak over steamed rice or with noodles.
Notes
- You can use any cut of beef that is good for slow cooking, such as round steak or chuck.
- For extra flavor, add a few dashes of hot sauce or red pepper flakes for some heat.
- This dish pairs wonderfully with rice, mashed potatoes, or steamed vegetables.
- If you like a more robust sauce, you can add more Worcestershire sauce or soy sauce to taste.
- Leftovers can be stored in the fridge for up to 3 days or frozen for up to 1 month.
- You can add other vegetables, such as mushrooms, carrots, or snow peas, to the Crock Pot for more variety.
- For a lighter version, use less oil and go easy on the sugar.
- If you prefer a gluten-free version, use tamari sauce instead of soy sauce.
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