Preheat the oven to 375°F (190°C) and lightly grease a muffin tin or a donut pan.
In a medium bowl, whisk together the flour, baking powder, cinnamon, and salt.
In a separate bowl, beat the eggs, then add milk, brown sugar, melted butter, vanilla extract, and lemon juice. Stir until smooth.
Gradually combine the wet ingredients with the dry ingredients, mixing until just incorporated. Fold in the chopped apples.
Spoon the batter evenly into the muffin or donut pan, filling each slot about ⅔ full.
Bake for 18-20 minutes, or until a toothpick inserted comes out clean.
While the fritters are baking, prepare the glaze by whisking together powdered sugar, milk, vanilla, and cinnamon (if using).
Let the fritters cool for a few minutes, then drizzle the glaze over the warm fritters.
Serve immediately and enjoy!