Heat oven to 375°F. Grease 9-inch round pan. In small bowl, stir streusel ingredients until crumbly; set aside.
In medium bowl, mix coffee cake ingredients until blended. Spread in pan. Sprinkle with streusel.
Bake 18 to 22 minutes or until golden brown.
High Altitude (3500-6500 ft): Heat oven to 425°F. Use 9-inch square pan. Stir 2 tablespoons all-purpose flour into the 2 cups Bisquick mix. Increase milk to 3/4 cup. Bake 15 to 20 minutes. Serves 8-10