Combine the ground beef, chopped pepperoni, parsley, garlic, egg, Italian breadcrumbs, milk, seasoned salt, Italian seasoning, and black pepper together in a mixing bowl.
Place onto a small rimmed baking sheet sprayed with non-stick spray and place in the oven and bake. Remove the meatloaves from the oven and allow to rest .
At the same time, add the pizza sauce to a small saucepan over medium heat. Cook until heated through, stirring occasionally.Pour the warm pizza sauce on top of the meatloaves and serve.