Good-Cooking - 1959 City School Sour Cream Coffee Cake

Ingredients

• 1 1/2 cups cake flour
• 1/2 cup all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• 1/2 cup butter
• 1 cup granulated sugar
• 1 egg, lightly beaten
• 1 teaspoon vanilla extract
• 1 cup sour cream
• 1/4 cup all-purpose flour
• 3/4 cup brown sugar, packed
• 1/4 teaspoon salt
• 1 cup chopped walnuts
• 1/4 cup butter