1 lb. ground beef, browned & drained
1 sm. onion, chopped

Blend at High speed for one minute:

1 1/2 c. milk
2 tsp. salt
1/2 tsp. pepper
3 eggs
1 c. Bisquick

Pour over ground beef mixture. Arrange thinly sliced tomatoes on top of batter. Cover all with a layer of your favorite shredded cheese. Bake at 375 degrees for 45 to 60 minutes until center is set and top is golden brown.