Fry hamburger and onion. In a separate bowl, mix cheese and olives. After hamburger has cooled, add to cheese and olive mix. Mix tomato sauce and enchilada sauce together (if using red sauce). Pour some sauce into the bottom of a glass casserole dish. Line bottom of the dish with tortillas, cutting as needed to cover the bottom. Top with meat and cheese mix. Then top with tortillas, pour sauce over the top and add grated cheese. Cook in the microwave for until hot (5-10 minutes).