Slow Cooker Pizza Casserole Recipe Type: Entree Cuisine: Italian Prep time: 15 mins Cook time: 3 hours Total time: 3 hours 15 mins Serves: 6 servings Ingredients 1 pound lean ground beef 2 1/2 cups (10 ounces) whole wheat penne pasta, dry 2 1/2 cups marinara sauce 1 cup shredded mozzarella cheese, part-skim 2/3 cup