Western Macaroni and Cheese Casserole

Preheat oven to 350 degrees. Prepare macaroni and cheese according to package directions. Meanwhile, combine ground beef, celery, green pepper and onion in a large skillet over medium high heat. Cook until beef is browned and vegetables are crisp tender, stirring frequently. Stir in corn, tomato paste, water, salt, pepper and prepared macaroni and cheese. Transfer the casserole mixture to a gresed 2 quart casserole dish. Bake casserole 10 to 15 minutes until heated through.