Preheat your oven to 375°F (190°C). Bring the deep-dish pie crust to room temperature, fit it into the pan, prick the base, and pre-bake for 10 minutes.

In a large skillet, heat olive oil over medium heat. Add ground beef and sausage, breaking them up until browned and cooked through, about 8-10 minutes. Season with salt, black pepper, garlic powder, and Italian seasoning.

Spread pizza sauce evenly over the pre-baked crust, layer half of the mozzarella cheese, then the meat mixture, more pizza sauce, and the remaining mozzarella cheese.

Spread pepperoni slices over the top and sprinkle Parmesan cheese if using.

Bake for 25-30 minutes until cheese is bubbly and golden brown.

Let the pie cool for 5-10 minutes, then slice into wedges to serve.