1 lb. ground beef
1 sm. onion
1 can cream of mushroom soup
1 soup can evaporated milk
1 (4 oz.) can green chilies
1 (5 1/2 oz.) bag Doritos
8 slices American cheese

Brown meat and onion. Add soup, milk and chilies. Mix well. Add Doritos and mix. Lay slices of cheese on top. Bake at 300 degrees unti cheese melts and is bubbly.