1. 1. Preheat the Oven: Prepare your oven according to the instructions on the puff pastry package, typically around 400°F.

2. 2. Roll Out the Puff Pastry: Lightly flour your work surface and roll out the puff pastry sheets to a thickness of about 1/8 inch.

3. 3. Cut the Pastry: Using a sharp knife or a pizza cutter, cut the puff pastry into rectangular shapes, approximately 4×6 inches in size.

4. 4. Add the Fillings: Place your desired savory fillings, such as cheese, bacon, or spinach, on half of the rectangles, leaving a slight border around the edges.

5. 5. Seal the Pop-Tarts: Carefully place the remaining puff pastry rectangles over the filled ones and use a fork to crimp and seal the edges.

6. 6. Egg Wash and Toppings: Brush the tops of the Breakfast Pop-Tarts with the egg wash and, if desired, sprinkle with sesame seeds or other savory toppings.

7. 7. Bake to Perfection: Transfer the assembled Breakfast Pop-Tarts to a parchment-lined baking sheet and bake for 18-22 minutes, or until the pastry is golden brown and puffed up.

8. 8. Cool and Serve: Allow the Breakfast Pop-Tarts to cool for a few minutes before serving. Enjoy them warm or at room temperature.