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Combine 1/2 cup sugar and cinnamon and set aside.
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Combine flour, baking powder, baking soda and salt.
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Cream the butter, add sugar, eggs, vanilla and sour cream.
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Add the flour mixture to the creamed mixture and mix until combined, do not overmix. This batter will be thick.
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Spoon half the batter into a greased and floured 10" bundt pan. Sprinkle the sugar and cinnamon mixture on top and spoon the remaining batter on top.
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Bake at 375 for 35-45 minutes or until toothpick inserted comes out clean.
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Cool 10 minutes and invert onto a plate. Cool for another 20 minutes and place the cake into a large plastic bag which really makes the cake moist.
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For variations:.
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- add walnuts or pecans with the sugar/cinnamon mixture.
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- spread chocolate chips in place of the sugar/cinnamon mixture as this tastes excellent.