1 lb. ground beef
1 med. onion, chopped
1 (No. 2) can tomatoes, chopped & drained
1 can green chilies, chopped
1 sm. pkg. Velveeta cheese, grated
1 can cream of chicken soup
1 med. bag Doritos

Cook beef until crumbly and gray in color, but not brown. Add all other ingredients except for cheese and chips. Stir and let simmer. Crush chips. Put layer of chips in bottom of casserole dish. Layer meat mixture and cheese. Leave enough cheese to layer on top. Bake at 375 degrees for 20 to 25 minutes.