• 1 pound lean ground beef
• 1/3 cup chopped onion
• 1 package (3/4 ounce) mushroom gravy mix
• 3/4 cup water
• 1 jar (2 1/2 ounces) sliced mushrooms, drained
• 1 cup sour cream
• 1 cup Original Bisquick« mix
• 1/4 cup milk
• 1 egg
• 1 small bell pepper, cut into rings

1. Heat oven to 400?F. Grease rectangular baking dish, 11x7x1 1/2 inches. Cook beef and onion in 10-inch skillet over medium heat, stirring occasionally, until beef is brown; drain. Stir in gravy mix (dry), water and mushrooms. Cook 1 to 2 minutes, stirring constantly, until thickened; remove from heat. Stir in sour cream. Spoon mixture into baking dish.
2. 2. Stir Bisquick mix, milk and egg until blended. Spread evenly over beef mixture. Top with bell pepper rings.
3. 3. Bake 18 to 22 minutes or until topping is light golden brown. Let stand 5 minutes before cutting.

Serve With Round out this meal with a fresh-fruit salad from the deli.
Substitution The next time you make this casserole, omit the bell pepper rings and sprinkle the topping with paprika.