Brown ground beef and drain. Add cream of mushroom soup, diced tomatoes and green chilies (do not drain juice) and ranch style beans. Mix well. Simmer 10-15 min, stirring occasionally.
While ground beef mixture is simmering, preheat oven to 375 degrees F. In a 9x13 inch baking dish, cover bottom with broken tortilla chips. Pour ground beef mixture over tortilla chips. Top with more tortilla chips and shredded cheddar cheese.