8 dinner rolls or hamburger buns 1 cup shredded mozzarella cheese ½ cup pizza sauce ¼ cup finely chopped bell pepper ¼ cup finely chopped onion ¼ cup chopped mushrooms, optional 2 tbsp sliced black olives, optional 1 tsp Italian seasoning ½ tsp garlic powder 1 tbsp melted butter 2 tbsp grated Parmesan cheese, optional Preheat oven to 375°F (190°C). Slice the buns in half and spread pizza sauce on the inside. Add mozzarella, bell pepper, onion, and any optional vegetables. Spr