Steps:
- Preheat oven to 350 degrees. Butter a 9″x13″ pan and set aside. Mix together flour, baking powder, baking soda, and salt. Set aside. Beat butter and sugar on medium speed until light and fluffy. Add eggs, one at a time, mixing well after adding each one. Add vanilla. Add flour mixture and sour cream. Mix just until blended. Spread batter evenly into pan. Make Crumb Topping: Combine flour, sugar, cinnamon, and salt. Cut in the butter with a pastry blender or a fork. When well mixed, the mixture should form large, moist clumps. Top batter with crumb topping. Bake for 35 to 40 minutes or until done. Turn the pan once during baking. Cool on a wire rack. Dust with confectioners' sugar.
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