Preheat your oven to 375°F (190°C).

In a skillet, cook the ground beef and Italian sausage (if using) over medium heat until browned, breaking it up with a wooden spoon. Drain any excess fat.

Stir in the pizza sauce, oregano, garlic powder, salt, and pepper. Simmer for 5 minutes, then remove from heat.

Unroll the pie crusts and fit one into the bottom of a 9-inch pie dish, pressing gently to cover evenly.

Spoon the meat mixture into the pie crust, spreading it evenly.

Layer the pepperoni slices on top of the meat, then sprinkle with shredded mozzarella.

Place the second pie crust over the pie, sealing the edges. Crimp the edges for decoration, or simply fold them under.

Cut a few slits in the top crust to allow steam to escape.

Bake for 30-35 minutes or until the crust is golden and the filling is bubbly.

Let it cool for about 10 minutes before slicing and serving.