Making the Deep Hamburger Sausage & Pepperoni Pie is a breeze with these step-by-step instructions:

1. Preheat the Oven: Begin by preheating your oven to 375°F (190°C).
2. Cook the Meats: In a large skillet, heat olive oil over medium heat. Add the ground beef and Italian sausage. Cook until fully browned and cooked through, about 8-10 minutes. Drain excess fat if necessary.
3. Sauté Vegetables: Add the chopped onion and minced garlic to the skillet. Cook for an additional 3-4 minutes until onions are translucent.
4. Season the Mixture: Stir in the Italian seasoning, salt, and pepper. Mix well and transfer to a large bowl. Allow it to cool slightly.
5. Add Cheese and Pepperoni: To the meat mixture, add half of the mozzarella and cheddar cheese, along with the pepperoni slices. Mix until combined.
6. Prepare the Pie Crust: Roll out your pre-made pie crust into a 9-inch deep-dish pie pan, pressing it gently into the edges.
7. Fill the Pie: Spoon the meat and cheese mixture into the prepared pie crust, spreading it evenly.
8. Top with Cheese: Sprinkle the remaining mozzarella and cheddar cheese over the top.
9. Cover with Lattice (Optional): If desired, roll out additional pie crust and cut into strips to create a lattice top over the filling. This adds a beautiful presentation!
10. Egg Wash: If you want a golden crust, brush the pie crust with a beaten egg to promote browning.
11. Bake: Place the pie in the preheated oven and bake for 45-50 minutes or until the crust is golden brown and the cheese is bubbling.
12. Cool: Once baked, remove the pie from the oven and let it cool for 10-15 minutes before slicing.
13. Garnish: Before serving, sprinkle fresh parsley on top for added flair and flavor.

These clear steps will help you create a remarkable Deep Hamburger Sausage & Pepperoni Pie that everyone will enjoy!