Southwestern Spaghetti Casserole Recipe

Cook spaghetti according to package directions. Meanwhile, in a large skillet, cook beef and onion over medium heat until meat is no longer pink; drain. Stir in the taco seasoning, spaghetti sauce, mushrooms and olives. Drain spaghetti; stir into the beef mixture. Transfer to a greased shallow 3-qt. baking dish; sprinkle with cheese. Bake, uncovered, at 350 ° for 25-30 minutes or until heated through. Serve with lettuce, tomatoes, sour cream, salsa and picante sauce. Freeze option: Cool unbaked casserole; cover and freeze. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Bake casserole as directed, increasing time as necessary to heat through and for a thermometer inserted in center to read 165 °. Serve with lettuce, tomatoes, sour cream, salsa and picante sauce.