Impossible Cheeseburger Pie

1 lb ground beef
1 cup chopped onion
1/2 tsp salt
1 cup shredded cheese
1/2 cup Bisquick or baking mix
1 cup milk
2 eggs

Heat oven to 400 degrees. Grease 9″ pie plate. Cook ground beef and onion until beef is brown. Drain. Stir in salt. Spread in pie plate, sprinkle with cheese.
Stir bisquick, milk and eggs until blended. Pour over ground beef and cheese.
Bake about 25 minutes or until knife inserted in center comes out clean.