Creating Ham and Cheese Puff Pastry Sticks is quite easy when you follow these steps:

1. Preheat the Oven: Begin by preheating your oven to 400°F (200°C). Line a baking sheet with parchment paper for easy cleanup.
2. Prepare Pastry: Unfold the puff pastry sheets on a clean surface. Cut each sheet into 3 equal strips, making six strips in total per sheet.
3. Mix Filling: In a bowl, combine the diced ham, shredded cheese, Dijon mustard (if using), garlic powder (if using), salt, and pepper. Mix until well combined.
4. Assemble Sticks: Place a generous spoonful of the filling onto the center of each pastry strip.
5. Fold and Seal: Fold the pastry over the filling to create a stick shape. Press the edges together to seal, using a fork to crimp them for extra security.
6. Egg Wash: Brush the tops of the pastry sticks with the beaten egg to achieve a golden-brown finish.
7. Sprinkle Toppings: If desired, sprinkle sesame seeds or poppy seeds on top of the egg-washed pastry for added flavor and crunch.
8. Bake: Place the pastry sticks on the prepared baking sheet and bake for 15-20 minutes or until golden and puffed.
9. Cool: Remove from the oven and allow to cool for about 5 minutes before serving.

These simple instructions make it easy to create professional-quality Ham and Cheese Puff Pastry Sticks in your own kitchen!