Making Apple Cinnamon Breakfast Croissants is a fun and rewarding process. Follow these simple steps:

1. Prepare the Apples: In a bowl, mix the diced apples with lemon juice, granulated sugar, and ground cinnamon. Set aside to allow the flavors to meld.
2. Preheat the Oven: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
3. Roll Out the Puff Pastry: On a lightly floured surface, roll out the puff pastry sheets to smooth out any creases. Cut each sheet into triangles (about 4-5 inches wide).
4. Fill the Croissants: Place a spoonful of the apple mixture at the wide end of each triangle. Drizzle a small amount of melted butter over the apples.
5. Roll the Pastries: Starting from the wide end, carefully roll the triangle toward the point to form a croissant shape. Ensure the point is tucked underneath.
6. Brush with Egg Wash: Place the croissants on the prepared baking sheet. Brush the tops with the beaten egg to give them a nice golden color when baked.
7. Bake: Bake in the preheated oven for 25-30 minutes or until golden brown and flaky.
8. Cool: Once baked, remove the croissants from the oven and allow them to cool slightly on a wire rack.
9. Dust with Powdered Sugar (Optional): For an added touch, dust with powdered sugar before serving.

These steps will guide you in creating these incredible croissants effortlessly!