Sloppy Joe Pot Pie

1 pound hamburger meat

1 onion, chopped

1 can sloppy joe sauce

1 cup shredded cheddar cheese

1 cup bisquick

1/2 cup milk

1 egg

Heat oven to 400.  Brown hamburger meat and onion.  Drain.  Transfer to a greased casserole dish.  Stir sloppy joe sauce into cooked meat mix.  Sprinkle with cheese.  Stir together the bisquick, milk and egg.  Pour over meat mix.  Bake 30 minutes.