1

Grease and flour 10" fluted tube pan; set aside.

2

To prepare streusel mixture: In a medium bowl, stir together flour, brown sugar and cinnamon. Using a pastry blender, cut in butter until crumbly. Stir in ¾ cup of the nuts; set aside.

3

Preheat oven to 350°F.

4

To prepare cake: In a large bowl, beat butter with an electric mixer on medium to high speed for 30 seconds. Beat in sugars until mixed. Add eggs, one at a time, beating well after each.

5

In a large bowl, stir together the flours and baking powder. In a small bowl, stir together sour cream and vanilla. Alternately add flour mixture and sour cream mixture to butter mixture, beating on low speed after each addition just until combined. Spoon half of the batter into prepared pan. Sprinkle with streusel mixture. Spoon remaining batter over streusel mixture.

6

Bake 50-55 minutes, or until a toothpick inserted near the center comes out clean. Cool in pan on a wire rack to 10 minutes; remove from pan.

7

To prepare icing: In a small bowl, stir together powdered sugar and maple syrup; drizzle over warm or cooled cake. Sprinkle with remaining ¼ cup nuts.