Beef Stroganoff Casserole

1 pound ground beef
1/3 cup chopped onion
3/4 cup water
1 small can mushrooms
1 (3/4 ounce) envelope mushroom gravy mix
1 cup sour cream
1 cup Bisquick
1 egg
1/4 cup milk
1 small bell pepper, cut into rings

Heat oven to 400 degrees F. Grease an 8-inch square baking dish.

Cook beef and onion over medium heat, stir occasionally, until beef browns; Drain. Stir in mushroom gravy mix (dry), water and mushrooms cook 1 to 2 minutes stirring constantly until thicken. Remove from heat. Stir in the sour cream and spoon mixture into baking dish.

Mix Bisquick, egg and milk until blended. Spread evenly over beef mixture. Top with bell pepper rings or paprika, if desired. Bake 18-22 minutes or until topping is light golden brown. Let stand 5 minutes before cutting.

Serves 6.