Taco Pizza

1 loaf frozen white bread dough
1 pound hamburger
1 package taco seasoning
1 onion
1 tomato, diced
1 cup sour cream
1/3 cup mayonnaise
1 cup shredded Cheddar cheese

Let dough thaw all day in a covered, greased 13 x 9-inch pan.

Cook hamburger, onion and taco seasoning according to directions on taco package.

Pat dough evenly in baking pan, then bake at 375 degrees F for 10 minutes.

Place hamburger mix on top of baked dough. Top with diced tomatoes, then combine sour cream and mayonnaise and spread it over the tomatoes. Sprinkle Cheddar cheese on top. Bake at 375 degrees F for 20 minutes.