Creating Baked Ham and Cheese Croissants can be straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Baking Sheet: Line a baking sheet with parchment paper or a silicone mat.
3. Roll Out Dough: Open the package of crescent roll dough and carefully unroll it. Separate it into triangles along the perforated lines.
4. Add Mustard: If desired, spread a thin layer of Dijon mustard on each triangle.
5. Layer Ham and Cheese: Place a slice of ham and a slice of cheese on the wider end of each triangle.
6. Roll Croissants: Starting from the wide end, roll each triangle tightly toward the point to form a croissant shape.
7. Place on Baking Sheet: Arrange the rolled croissants on the prepared baking sheet, leaving space between each.
8. Brush with Butter: Brush the tops with melted butter for a golden finish. Sprinkle sesame or poppy seeds on top if desired.
9. Bake: Place in the preheated oven and bake for 15-20 minutes or until golden brown and puffed.
10. Cool Slightly: Once baked, remove from the oven and let cool for a few minutes before serving.

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