Making Ham and Cheese Puffs is a simple process. Follow these steps to create your own delicious snacks:

1. Preheat the Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Roll Out Puff Pastry: On a lightly floured surface, roll out the puff pastry sheet to smooth out any creases.
3. Cut into Squares: Cut the puff pastry into squares, approximately 3×3 inches in size.
4. Prepare Filling: In a bowl, combine the diced ham, shredded cheese, and mustard. Mix well and season with salt and pepper.
5. Fill the Pastry: Place a spoonful of the ham and cheese mixture in the center of each square.
6. Seal the Puffs: Fold the pastry over to create a triangle and press the edges to seal. Use a fork to crimp the edges for an extra seal.
7. Apply Egg Wash: Beat the egg in a small bowl and brush it over the tops of the puffs for a golden finish.
8. Bake: Place the puffs on the prepared baking sheet and bake for 15-20 minutes or until golden brown and puffed up.
9. Cool: Allow the puffs to cool for a few minutes before serving.

Following these steps will help you create amazing Ham and Cheese Puffs effortlessly.