Cook hamburg or chicken with onion until onion is tender.
Prepare enchilada sauce according to package directions. Pour 1/4 cup of sauce into a 13x9 baking dish.
On each tortilla place an equal portion of beef/chicken mixture and about 1 oz chees. Roll tortilla tightly and place seam side down in the baking dish.
Cover with the remaining sauce & sprinkle with the remaining cheese and olives.
Bake in preheated oven for 20 mins or until the sauce is bubbly and sheese is thorougly melted.