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Preheat oven to 350°F (175°C). Grease and flour a 10-cup bundt pan thoroughly.
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In a small bowl, mix together the chopped pecans, brown sugar, and cinnamon for the filling. Set aside.
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Cream the softened butter and white sugar in a stand mixer until light and fluffy.
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Add eggs one at a time, beating well after each addition. Stir in the vanilla extract.
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In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
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Gradually add the dry ingredients to the butter mixture, alternating with the sour cream. Mix until just combined.
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Pour half of the batter into the prepared pan. Sprinkle the pecan filling evenly over the batter.
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Top with the remaining batter and smooth the surface with a spatula.
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Bake for 50 minutes or until a toothpick inserted in the center comes out clean.
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Cool in the pan for 10 minutes before inverting onto a wire rack to cool completely.