While I was searching for Old River Road Bakery's Sunshine Cake recipe, I came across this one:
German Sour Cream-Streusel Coffee Cake - Old River Road Bakery Wilkes Barre Pa Serves 8 to 10 ingredients: 1 1/4 cups coarsely chopped walnuts 1 1/4 cups (packed) golden brown sugar 4 1/2 teaspoons ground cinnamon 4 1/2 teaspoons unsweetened cocoa powder 6 tablespoons dried currants 3 cups cake flour 1 1/2 teaspoons baking soda 1 1/2 teaspoons baking powder 3/4 teaspoon salt 3/4 cup (1 1/2 sticks) unsalted butter, room temperature 1 1/2 cups sugar 3 large eggs 1 tablespoon vanilla extract 1 16-ounce container sour cream 1 cup powdered sugar 1 tablespoon milk Preparation: Preheat oven to 350°F. Butter 12-cup Bundt pan. Mix first 5 ingredients in small bowl. Set nut mixture aside. Sift flour, baking soda, baking powder and salt into medium bowl. Using electric mixer, beat butter and 1 1/2 cups sugar in large bowl until blended. Beat in eggs 1 at a time. Mix in vanilla. Mix dry ingredients and sour cream alternately into butter mixture in 3 additions. Beat batter on high 1 minute. Pour 1/3 of batter into prepared pan. Sprinkle with half of nut mixture. Spoon 1/3 of batter over. Sprinkle with remaining nut mixture. Spoon remaining batter over. Bake cake until tester inserted near center comes out clean, about 1 hour. Cool cake in pan on rack 10 minutes. Cut around pan sides to loosen cake. Turn cake out onto rack and cool 1 hour. Transfer to platter. Whisk powdered sugar and milk in small bowl until smooth. Drizzle over coffee cake. Serve slightly warm or at room temperature. (Can be prepared 1 day ahead. Cool completely. Wrap in foil and let stand at room temperature.)