Brown the hamburger and onion together and drain. In a bowl, mix the cheddar cheese, soup, olives, oregano, garlic and the salt and pepper together. Separate the buns into the top and bottom and butter the bottom of each bun. Put a spoonful of hamburger on the top of each bun. Leave the buns open faced and bake at 350 degrees F for 15-20 minutes. Sprinkle mozzarella cheese on top of the hamburger for the last 5-10 minutes of baking.
By Robin from Washington, IA
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