1 med. pkg. Doritos
1 lb. ground beef
1 lg. onion, chopped
1 can Ranch style beans
1 can Ro-tel tomatoes with green chiles
1 can cream of mushroom soup
1 c. grated cheddar cheese

Crush Doritos and put in bottom of 12 x 7 x 2 inch baking dish. Brown ground beef. Combine other ingredients with beef except cheese. Top with grated cheese. Bake at 350 degrees for 30 minutes.