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Preheat oven to 375°.
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Line 12-cup muffin pan with paper liners.
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In a big bowl, whisk together the flour, brown sugar, 2 teaspoons cinnamon, and salt.
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Using your fingers, mix in the butter until mixture is crumbly.
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Transfer 2/3 cup to a small bowl for the topping; mix in pecans and remaining cinnamon; set aside.
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Whisk baking powder and baking soda into the remaining flour mixture.
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In a small bowl, whisk together the eggs and buttermilk until well blended.
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Add the egg mixture to the flour mixture and stir until just blended.
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Divide batter equally among prepared muffin cups.
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Top with the reserved cinnamon-pecan mixture.
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Bake for 16-21 minutes or until tops are golden and a pick comes out clean.
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Let cool in pan on a wire rack for 3 minutes, then transfer to the rack to cool.