Spaghetti Bread

Name: Spaghetti Bread
Ingredients: cooking spray; 0.5 teaspoon cornmeal; 1 (16 ounce) package prepared pizza dough; 1.5 cups cooked spaghetti; 0.25 cup spaghetti sauce, or to taste; 6 cooked meatballs, chopped - or to taste; 0.5 cup shredded mozzarella cheese; 2 tablespoons butter, melted; 0.5 teaspoon garlic salt, or to taste