Creating Ham Puffs is straightforward if you follow these easy steps:

1. Preheat Oven: Begin by preheating your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare Fillings: In a mixing bowl, combine the diced ham, cheese, green onions, Dijon mustard, salt, and pepper. Mix well until fully satisfied with the flavor.
3. Roll Out Pastry: On a floured surface, roll out the puff pastry to about 1/8 inch thick. Cut into squares (approximately 3×3 inches).
4. Fill Pastry: Place a spoonful of the ham mixture in the center of each pastry square. Be careful not to overfill.
5. Seal the Puffs: Fold the pastry square over to create a triangle. Press the edges tightly to seal, and use a fork to crimp the edges for added security.
6. Egg Wash: Brush the tops of each pastry with the beaten egg to give them a beautiful golden brown color while baking.
7. Bake: Arrange the Ham Puffs on the prepared baking sheet and bake for 15-20 minutes or until they are golden and puffy.

These steps will help you create flavorful Ham Puffs that will surely impress anyone who tries them.