Blueberry Croissant French Toast Bake (Make-Ahead Brunch)

I made this for the first time on a Saturday morning when I had leftover croissants sitting on the counter going slightly stale, and I honestly wasn't sure it would work. Half of them were from a Costco pack that had been open a day too long — a little dry, a little sad. But that turned out to be exactly what they needed to be, because stale croissants soak up custard better than fresh ones ever could. By the time it came out of the oven, golden on top and soft all the way through, I knew I was going to be making this on repeat.

What makes this different from regular French toast is that croissants are already buttery and layered — they absorb the egg custard without going completely mushy, and they hold a little structure while still getting creamy underneath. I use a simple custard of eggs, whole milk, heavy cream, vanilla, and cinnamon, and I press the croissants down gently so they soak all the way through. The blueberries do their thing in the oven — they burst and get jammy and sink into the custard in the best possible way. Fresh or frozen both work; I've used both and honestly can't tell the difference once it's baked.

This is the kind of thing I make when we have family visiting, or when I want a slow, easy weekend breakfast without actually standing at the stove. I assemble it the night before, cover it, leave it in the fridge, and then just slide it into the oven in the morning. By the time everyone is up and the coffee is made, breakfast is basically done. Zainab asks for it specifically on school holidays, which is how I know it's a keeper. If you're looking for something else to serve alongside a savory option, my breakfast taquitos make a great pairing for brunch spreads.

One thing I want to flag before you start: do not skip the resting time. Whether that's 10 minutes on the counter or overnight in the fridge, the croissants need time to absorb the custard before they go into the oven. The first time I made this I rushed it — poured the custard and immediately put it in the oven — and the bottom half was still eggy while the top was already golden. Give it time and it will reward you with that creamy, almost pudding-like centre that makes this bake so good.

Why You'll Love This Recipe

• It assembles the night before: The whole thing takes maybe 15 minutes of actual hands-on work — tear the croissants, make the custard, pour it over, press it down, cover it, and refrigerate. In the morning you pull it out, let it sit for a few minutes while the oven preheats, and bake. That kind of make-ahead setup has saved my mornings more times than I can count, especially when I have guests staying over.

• Croissants do something brioche can't: I've made French toast bakes with regular bread, brioche, and challah. They're all fine. But croissants have this flaky, buttery interior that absorbs custard differently — you get pockets of creamy filling between the layers, and the edges that stick out go golden and slightly crisp in the oven. It's a texture thing that makes this bake feel a step above the usual.

• The blueberries get jammy and sink in: Fresh blueberries are great if you have them, but frozen ones work just as well — don't bother thawing them, just scatter them straight in. As they bake they release juice into the custard, which turns everything around them this faint purple color that looks genuinely beautiful when you serve it. I always push some of the berries down between the croissant pieces so they bake into the middle, not just on top.

• No special equipment needed: I use a regular 9×13-inch baking dish, a bowl, a whisk, and that's basically it. No stand mixer, no fancy tools. If you don't have a whisk, a fork works fine for the custard — you just need to get the eggs fully incorporated into the milk and cream. This is genuinely one of the most low-effort things I make.

• Leftovers reheat well: This holds up in the fridge for a few days, and it reheats nicely in the microwave or a low oven. My husband actually prefers it the next day when the custard has had more time to settle. I make a full 9×13 pan every single time because there is never anything left after day two.

Ingredients

• 6 large croissants, torn into bite-sized pieces (day-old or slightly stale work best)
• 2 cups fresh or frozen blueberries (no need to thaw if frozen)
• 8 large eggs
• 2 cups whole milk
• ½ cup heavy cream
• ½ cup granulated sugar
• 2 teaspoons vanilla extract
• ½ teaspoon ground cinnamon
• ¼ teaspoon salt
• Butter or nonstick spray, for greasing the baking dish
• Powdered sugar, for dusting (optional)
• Maple syrup, for serving (optional)

Directions

• Step 1: Preheat and prep the dish. Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish with butter or nonstick spray. Getting the dish greased before you start layering means you won't forget it — I have forgotten it, and the edges stick in a way that's not fun to clean up.
• Step 2: Layer the croissants and blueberries. Tear the croissants into rough pieces — nothing precise, just bite-sized chunks — and spread them out in the dish. Scatter the blueberries over and in between the croissant pieces, pressing some of them down into the gaps so they bake into the custard rather than just sitting on the surface.
• Step 3: Make the custard. In a large bowl, whisk together the eggs, milk, heavy cream, sugar, vanilla, cinnamon, and salt until everything is smooth and the eggs are fully incorporated. This takes about a minute of real whisking — you want no streaks of egg yolk left.
• Step 4: Pour the custard over and press down. Pour the custard slowly and evenly over the croissants and blueberries. Then use your hands or the back of a spoon to press the croissants gently down into the liquid — you want them sitting in the custard, not floating on top of it. Every piece should be moistened.
• Step 5: Let it soak. Let the dish rest for at least 10–15 minutes at room temperature before baking, or cover it tightly and refrigerate overnight. The longer it soaks, the more evenly the custard distributes — overnight is better if you have the time.
• Step 6: Bake. Bake uncovered for 40–45 minutes, until the top is golden brown and the centre is set — it should jiggle only slightly when you shake the pan. If the top is browning fast but the centre is still liquid, tent a piece of foil loosely over the top and keep baking.
• Step 7: Rest and serve. Let the bake rest for about 5 minutes before serving — this helps it hold together when you scoop it. Dust with powdered sugar or drizzle with maple syrup, or both.

Tips for Success

• Use croissants that are at least a day old: I figured this out after my second batch came out slightly wetter than I wanted. Fresh croissants are already soft and a bit delicate — when you pour custard over them, they can start to break down and go mushy rather than absorbing. Slightly stale croissants are firmer and soak up the custard without losing their structure. If yours are fresh, spread the torn pieces on a sheet pan and leave them out uncovered for a few hours, or pop them in a low oven (about 275°F) for 10 minutes.

• Don't skip pressing the croissants down: After you pour the custard, pressing the pieces down is what makes the difference between an evenly soaked bake and one where the top layer stays dry and spongy. I use my hands — washed, obviously — and just press everything gently for about 30 seconds. It makes a real difference in how it bakes through.

• Add lemon zest to the custard: This was a late addition for me and now I never skip it. Half a teaspoon of fresh lemon zest whisked into the custard cuts through the richness and makes the blueberry flavor brighter. It's a small thing that noticeably changes the flavor. If you're already making my rhubarb cookies for a brunch spread, you'll already have a lemon out on the counter anyway.

• Tent with foil if the top browns too fast: Every oven is different, and mine runs a little hot. If you notice the top getting deeply golden before the 35-minute mark, lay a piece of aluminum foil loosely over the top — don't press it down — and keep baking until the centre is set. You want that creamy, custard-like inside, not dried-out egg.

• Let it rest before serving: I know it's hard to wait when it's sitting there smelling incredible, but 5 minutes of resting makes it so much easier to serve. Right out of the oven it's a bit loose; after a short rest the custard firms up just enough that you can scoop neat portions without everything falling apart.

Variations

• Lemon cream cheese swirl: Mix 4 ounces of softened cream cheese with 2 tablespoons of powdered sugar and a teaspoon of lemon zest, then drop small spoonfuls between the croissant layers before pouring the custard. The cream cheese melts into pockets of tangy richness as it bakes — it makes the whole thing feel a bit more dessert-like, which honestly I'm not complaining about.

• Mixed berry version: Swap half the blueberries for raspberries or sliced strawberries. Raspberries in particular work beautifully — they break down faster in the oven and create these streaks of deep red jam throughout the custard. I sometimes make this version in summer when all three fruits are cheap at the market at the same time.

• Almond crunch topping: Scatter ¼ cup of sliced almonds and 2 tablespoons of brown sugar over the top just before it goes in the oven. The almonds toast as it bakes and give you a little crunch against the soft custard underneath. This is my husband's preferred version — he likes texture contrast in everything he eats.

• Chocolate chip version: Scatter ⅓ cup of mini chocolate chips over the croissants before the custard goes in. It leans more dessert than breakfast, but if your kids are anything like Saad, that's not going to be a problem. I've served this as an after-school treat with a scoop of vanilla ice cream and no one complained.

• Spiced fall version: Add a pinch of nutmeg and a pinch of ground cloves to the custard alongside the cinnamon. It makes the whole thing taste warmer and more autumnal — almost like a bread pudding. I make this version in October and it's particularly good drizzled with maple syrup and served alongside apple pie cheesecake cookies for a full autumn brunch spread.

Serving and Storage

Serving

Serve warm, straight from the baking dish. A dusting of powdered sugar is my default finish — it looks nice and adds a little sweetness without being heavy. Maple syrup on the side lets people control how much they want. If I'm serving guests, I'll sometimes do both plus a small bowl of fresh blueberries on the side to make it look intentional. It pairs well with plain yogurt or a fruit salad if you want to balance out the richness. For a fuller brunch spread, my cheesecake deviled strawberries are a great no-bake addition that takes about 10 minutes to pull together.

Storage

Cover leftovers tightly or transfer to an airtight container and refrigerate for up to 4 days. To reheat individual portions, microwave for about 90 seconds, checking halfway through. To reheat the whole dish, cover with foil and warm in a 325°F oven for 15–20 minutes. I don't recommend freezing this one — the custard texture changes once it's been frozen and thawed, and it gets watery in a way that's hard to fix.

Frequently Asked Questions

Can I assemble this the night before?

Yes, and I'd actually recommend it. Assemble everything, press the croissants down into the custard, cover tightly with plastic wrap, and refrigerate overnight. In the morning, pull it out while the oven preheats and let it sit on the counter for 10 minutes before baking. Overnight soaking makes the custard absorb more evenly and the texture is noticeably better than when you bake it right away.

Can I use frozen blueberries instead of fresh?

Absolutely. I use frozen ones at least half the time because they're cheaper and I always have them in the freezer. Don't bother thawing them first — just scatter them in straight from the bag. They'll release a little extra juice as they bake, which actually makes the custard around them taste even more blueberry-forward.

What can I use instead of croissants?

Brioche or challah are the closest substitutes — both are rich and eggy and soak up custard well. Regular sandwich bread will work in a pinch but the result is noticeably less rich and the texture is softer and less interesting. If you use brioche or challah, cut them into roughly 1-inch cubes and use the same amounts.

Why is my bake coming out soggy in the middle?

Two things usually cause this: fresh (not stale) croissants, or not enough baking time. Fresh croissants break down faster and can get waterlogged. Day-old croissants absorb the custard without dissolving. Also make sure you're baking until the centre is just set — give the pan a gentle shake at the 40-minute mark, and if it's still very liquid in the middle, keep going another 5 minutes. Every oven is a little different.

Can I reduce the sugar if I want it less sweet?

Yes. The recipe uses ½ cup of granulated sugar in the custard, and you can drop that to ⅓ cup without it affecting the texture at all. The blueberries add their own natural sweetness, and if you're serving with maple syrup on top, you don't need the base to be very sweet. I sometimes go with ⅓ cup when I'm serving it for a regular weekend breakfast rather than a special occasion.

This blueberry croissant bake has quietly become one of my most-made weekend breakfasts. I like that I can put it together on a Friday night when I have 15 minutes of energy left, then wake up on Saturday and just bake it. There's no standing over the stove, no flipping anything, no timing things in batches. It comes out of the oven looking genuinely impressive for almost no effort, and the leftovers — if there are any — are just as good reheated the next day.