Creating delicious croissant breakfast sandwiches is easy with these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Croissants: Slice each croissant in half horizontally, creating a top and bottom.
3. Cook Eggs: In a bowl, whisk the eggs with salt and pepper.
4. Melt Butter: In a skillet over medium heat, melt the butter.
5. Scramble Eggs: Pour the whisked eggs into the skillet, scrambling them until they are fully cooked. Remove from heat.
6. Assemble Sandwiches: On the bottom half of each croissant, layer the scrambled eggs, cheese, and your choice of protein.
7. Top with Croissant: Place the top half of the croissant over the filling.
8. Bake: Place the assembled sandwiches on a baking sheet and bake for about 5-7 minutes, or until the cheese is melted and the croissants are warm.
9. Garnish: Remove from the oven and sprinkle with fresh herbs, if desired.

These steps will guide you to create incredible croissant breakfast sandwiches that are perfect for any morning.