Sour Cream Coffee Cake
["2 sticks butter or margarine, softened", "2 c. sugar", "2 eggs", "1 c. sour cream", "1/2 tsp. vanilla", "2 c. sifted flour", "1 tsp. baking powder", "1/4 tsp. salt", "3/4 c. chopped walnuts", "1 tsp. cinnamon", "4 Tbsp. brown sugar", "sifted confectioners sugar for top (optional)"]
["Grease and flour tube pan.", "Preheat oven to 350\u00b0.", "Cream together the butter and sugar.", "Add eggs, sour cream and vanilla; mix well.", "Sift together the flour, baking powder and salt.", "Add dry ingredients, blending thoroughly at medium speed."]
["butter", "sugar", "eggs", "sour cream", "vanilla", "flour", "baking powder", "salt", "walnuts", "cinnamon", "brown sugar", "confectioners sugar"]