Creating Baked Ham and Cheese Croissants is straightforward. Follow these simple steps for success:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Baking Sheet: Line a baking sheet with parchment paper for easy cleanup.
3. Unroll Croissant Dough: Carefully unroll the refrigerated croissant dough and separate it into triangles.
4. Add Mustard: If desired, spread a small amount of Dijon mustard on each triangle for an extra flavor kick.
5. Layer Ham: Place one slice of ham on each triangle, ensuring it covers most of the dough.
6. Add Cheese: Top the ham with one slice of cheese, or sprinkle shredded cheese over the ham for more coverage.
7. Roll Croissants: Starting from the wide end, roll each triangle tightly towards the pointed end, forming a croissant shape.
8. Place on Baking Sheet: Arrange the rolled croissants on the prepared baking sheet, leaving space between each one.
9. Prepare Egg Wash: In a small bowl, whisk the egg. Brush the egg wash over each croissant for a golden finish.
10. Season: Sprinkle with salt and pepper to taste if desired.
11. Bake: Bake in the preheated oven for 20-25 minutes or until golden brown and flaky.
12. Cool: Remove from the oven and allow to cool for about 5 minutes before serving.

These steps will guide you in creating these incredible croissants effortlessly, ensuring a delicious result every time!