Cheeseburger Pie

1 pound ground beef

1 ½ cup onion

½ tsp salt

¼ tsp pepper

1 ½ cup milk

¾ cup bisquick baking mix

3 eggs

1 cup grated cheese

tomato slices

Brown beef and onion together; drain.  Beat remaining ingredients together.  Put beef mixture in unbaked pie shell.  Pour liquid mixture over top.  Bake at 300-325 degrees for 45-50 minutes. 

Add tomato slices on top and sprinkle cheese over.  Bake 5 minutes longer.