Directions

1. In a large bowl, combine beef, pork, egg, Panko, Parmesan, garlic powder, onion powder, allspice and nutmeg; season with salt and pepper, to taste. Using a wooden spoon or clean hands, stir until well combined. Roll the mixture into 1 1/4-to-1 1/2-inch meatballs, forming about 18-20 meatballs.
2. Heat olive oil in a large stockpot or Dutch oven over medium heat. Add meatballs, in batches, and cook until all sides are browned, about 3-4 minutes. Stir in marinara sauce until warmed, about 3-4 minutes.
3. Preheat oven to broil. Line a baking sheet with foil.
4. Place dinner rolls in a single layer onto the prepared baking sheet. Place meatballs into rolls, about 3 per roll; top with cheeses.
5. Place into oven and bake until the cheeses have melted, about 3-4 minutes.
6. Serve immediately.