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Heat oven to 350 degrees. Lightly Pam spray a spring-form pan (can use any pan).
Filling and Streusel-
Mix nuts, brown sugar and cinnamon in a medium bowl. Remove 1 1/4 cups for filling. For streusel, add flour and butter to mixture remaining in bowl; cut in with a pastry blender until the mixture resembles coarse crumbs.
Batter-
Beat butter, sugar, baking powder and baking soda in a large bowl with mixer on high speed 4 minutes or until pale and fluffy. Add eggs one at a time, beating well after each. Beat in vanilla until blended.
With mixer on low speed, beat in flour in 3 additions, alternating with sour cream in 2 additions, just until blended. Spread 1/2 of the batter (about 3 cups) evenly in prepared pan. Sprinkle with reserved filling, pressing it gently into the batter. Spoon on remaining batter, spread evenly, then sprinkle with the streusel. Bake
1 hour to 1 hour 10 minutes or until a wooden pick inserted in center comes out clean.
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