- To freeze and bake later, prepare recipe as directed except do not add cheese or corn chips. Place mixture into casserole dish 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 30 minutes. Uncover; continue baking 20-30 minutes or until heated through. Sprinkle with crushed corn chips and cheese. Continue baking 5 minutes or until cheese is melted.