Kristy'S Mexican Casserole
["1 lb. ground beef (lean)", "1 medium onion, diced", "1 pkg. tortilla chips", "2 cans Ro-Tel tomatoes", "4 or 5 oz. grated cheese"]
["Brown meat and onion until done.", "Line pan with chips (15 x 11-inch pan).", "Add layer of meat mixture, cover with tomatoes and top with cheese.", "Bake at 350\u00b0 until cheese melts."]
["ground beef", "onion", "tortilla chips", "Ro-Tel", "grated cheese"]