3-Pasta Beef Casserole

Ingredients

• 1-1/2 cups uncooked mostaccioli pasta, cooked and drained
• 1-1/2 cups uncooked rotini pasta, cooked and drained
• 1-1/2 cups uncooked rigatoni pasta, cooked and drained
• 1/2 pound ground beef, browned and drained
• 1/2 pound sliced pepperoni
• 2 (1 pound, 10 ounce) jars spaghetti sauce
• Salt and pepper to taste
• 1/2 teaspoon garlic salt, optional
• 2 (8-ounce) packages shredded mozzarella cheese