Walnut Streusel Coffee Cake

Directions

• In a small bowl, mix walnuts, brown sugar, butter and cinnamon.
• Place egg whites in a large bowl; let stand at room temperature 30 minutes. Preheat oven to 350°. Grease and flour a 10-in. fluted tube pan.
• In a large bowl, cream butter and sugar until light and fluffy. Gradually add egg yolks. Beat in vanilla. In another bowl, whisk flour, baking powder, baking soda and salt; add to creamed mixture alternately with sour cream, beating well after each addition.
• With clean beaters, beat egg whites on medium speed until stiff peaks form. Fold into batter.
• Pour half of the batter into prepared pan; sprinkle with walnut mixture. Pour in remaining batter. Bake 45-55 minutes or until a toothpick inserted in center comes out clean. Cool 10 minutes before removing from pan to a wire rack to cool completely. Dust with confectioners' sugar.