Brown onion and beef together; drain fat. Add olives. While cooking meat, pour sauces into lg. pan and heat well. Dip 1 tortilla into sauce, fill w/ meat and cheese, roll up, and lay folded side down in baking pan. Cont. w/ all tortillas. Sprinkle top w/ leftover meat and cheese and sauce. Bake covered in 350* oven for 30-40 minutes. Uncover and bake 15 minutes more.