- To freeze and bake later, prepare rigatoni and sauce as directed. Place into casserole or large freezer container. Cover tightly; freeze up to 3 months. To thaw, place in refrigerator for 24 hours or until thawed. Heat oven to 350°F. Place mixture into ungreased casserole dish, if necessary. Cover; bake 25 minutes. Stir; sprinkle top with 1/4 cup Parmesan cheese. Cover; continue baking 10-20 minutes or until heated through.