3 lbs. ground beef
1 med. chopped onion
1 pkg. taco seasoning mix
1 lg. pkg. taco flavored Doritos
1 can Rotel
1 can tomato soup
1 can cream of mushroom sup

Brown meat; add onion until tender. Add taco seasoning; set aside. Mix Rotel, tomato soup, and cream of mushroom soup; set aside. Layer in a large casserole dish, meat, Doritos, soup, meat, Doritos, soup, etc., ending Doritos. Top with 1 cup grated cheddar cheese. Bake at 350 degrees for 45 minutes.