1 1/2 lb. ground beef
1 onion, chopped
2 cans tomatoes
1 can cream of mushroom soup
1 (5 oz.) pkg. noodles, cooked & drained
1 pkg. taco seasoning mix

Cook ground beef and onion until browned. Add tomatoes, soup, noodles and taco seasoning and mix well. Pour into a greased 9 x 13 inch baking dish. Cover with grated Cheddar cheese. Bake at 325 degrees until melts.