1Heat oven to 400ºF. In 12-inch skillet, cook beef, onion, mushrooms and salt over medium heat, stirring occasionally, until beef is brown.
2While beef is cooking, in 2-quart saucepan, heat water and butter to boiling; remove from heat. Stir in dry potatoes and sour cream. Let stand 1 minute, then stir vigorously until smooth. Stir in 2/3 cup Bisquick mix, the chives and egg.
3Drain beef mixture. Stir 3 tablespoons Bisquick mix into soup. Stir soup mixture, broccoli and ketchup into beef mixture. Heat to boiling. Boil uncovered 1 minute. Pour into ungreased 3-quart casserole. Scoop potato dumpling mixture around edge of casserole.
4Bake uncovered 25 to 30 minutes or until dumplings are light golden brown.