Creating a croissant breakfast sandwich can be straightforward if you follow these simple steps:

1. Prepare Ingredients: Gather all your ingredients. If using bacon or ham, ensure they are cooked and ready to use.
2. Whisk Eggs: In a bowl, whisk together the eggs, salt, and pepper until well combined.
3. Cook Eggs: Heat a skillet over medium heat and add a small amount of butter. Pour in the egg mixture and cook, stirring gently until the eggs are scrambled and just set. Remove from heat.
4. Slice Croissants: Carefully slice each croissant in half horizontally.
5. Layer Ingredients: On the bottom half of each croissant, layer some scrambled eggs, followed by cheese, bacon or ham (if using), and spinach or arugula.
6. Top with Croissant: Place the top half of the croissant on each sandwich.
7. Toast the Sandwich: In the same skillet, add more butter and place the sandwiches in the pan. Toast for 2-3 minutes on each side until golden brown and the cheese melts.
8. Serve Warm: Remove from the skillet and serve immediately. Add hot sauce or herbs if desired for added flavor.

These steps will guide you in creating this incredible sandwich effortlessly.