Heat oven to 350. Coat 8 inch baking pan with nonstick cooking spray. In a med bowl stir together flour sugars, pumpkin pie spice and salt. With pastry cutter, cut butter into the mixture. Stir in walnuts. Refrigerate.
In a large bowl, whisk together the flour, baking powder, baking soda, pumpkin pie spice and salt. Set aside. In another lg bowl, beat butter and sugars on medium speed until creamy and blended about 3 min. Beat in eggs, one at a time. Add vanilla and beat until smooth.
on low speed beat in the flour mixture in 3 additions, alternating with buttermilk. Beat for 2 minutes. Spoon half of the batter into the prepared pan. Sprinkle half of the topping over the batter. Spoon remaining batter over topping. Sprinkle remaining topping over top of cake.
Bake at 350 for 50 to 60 min. Cool completely on wire rack. Loosen edges with a knife or small spatula. Cut into 12 equal pieces. In a small bowl, mix together confectioners' sugar and just enough milk to get a good drizzling consistency. Drizzle over cake squares and allow to set before serving.
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