Corned Beef and Potato Cheese Bake

1 (10 ounce) can refrigerated prepared pizza crust 1/2 lb corned beef , cut into 1/2 inch cubes 1 tablespoon butter 1/2 chopped onion 1 1/2 cups frozen[...]

1 (12 ounce) can corned beef , crumbled 1 2/3 cups macaroni (cooked and drained) 1 1/2 cups cheddar cheese , grated 1 1/4 cups milk 1 (10 1/4 ounce) can[...]