Streusel Coffee Cake

I remember Mom making this when I was a kid....Yum.....another recipe with brown sugar!!! I will double the Streusel topping

Streusel topping
1/3 cup Original Bisquick® mix
1/3 cup packed brown sugar
1/2 teaspoon ground cinnamon
2 tablespoons firm butter or margarine

Coffee Cake
2 cups Original Bisquick® mix
2/3 cup milk or water
2 tablespoons sugar
1 egg

1.Heat oven to 375°F. Grease 9-inch round pan. In small bowl, stir streusel ingredients until crumbly; set aside.
2.In medium bowl, mix coffee cake ingredients until blended. Spread in pan. Sprinkle with streusel.
3.Bake 18 to 22 minutes or until golden brown.