Preheat oven to 425°F. Line a sheet tray with parchment paper, set aside. (You could also make the meatballs on a broiler pan.)
Add the ground beef, Italian sausage, parmesan cheese, breadcrumbs, onion, egg, granulated garlic powder, onion powder, black pepper, dry Italian seasoning in a large bowl. Use a rubber spatula or your hands to combine.
Roll meat mixture and roll it in your hands to form a 1 inch ball. Place on the prepared sheet tray, not touching. Repeat with the remaining meat mixture.
Bake meatballs for 12-15 minutes or until golden brown, and they reach 165°F internal temperature. Let cool on the pan while you prepare the crust.
To prepare the crust: Lightly spray two 14-inch pizza pans with cooking spray. Stretch and pat the pizza dough even thickness onto the pans. Dock the crust using a fork, then drizzle with a small amount of olive oil (about 1 Tablespoon on each) and brush all over.
Place into the oven and bake for 8 minutes or just until lightly browned.
Meanwhile, cut the meatballs in half and set aside.
To assemble: Remove the par baked crust from the oven and spread each pizza with ½ cup pizza sauce. Spread evenly leaving a 1/2 inch border along the edge. Sprinkle each crust with 1 cup mozzarella cheese, then arrange the meatball halves on top.
Season both pizzas with granulated garlic and Italian seasoning, topping with the remaining (1 cup each) shredded cheese. Sprinkle each pizza with 2 Tablespoons grated Parmesan.
Place back into the oven and bake for 10-12 minutes or until golden brown along the crust and the cheese has melted and browned.
Let stand for 5 minutes, then slice and enjoy.