01 -
Preheat oven to 350°F. Line a muffin tin with paper liners or grease thoroughly.
02 -
In a large mixing bowl, whisk together all-purpose flour, granulated sugar, brown sugar, baking powder, baking soda, and salt until evenly blended.
03 -
In a separate bowl, whisk together melted unsalted butter, eggs, buttermilk, and vanilla extract until smooth.
04 -
Pour wet mixture into the bowl with dry ingredients. Stir gently until combined; avoid overmixing.
05 -
Fold in the chopped pecans using a spatula, distributing them evenly throughout the batter.
06 -
Spoon batter into the prepared muffin cups, filling each about two-thirds full.
07 -
In a small bowl, stir together corn syrup and packed brown sugar until smooth. Place about 1 tablespoon of this mixture over each muffin.
08 -
Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
09 -
Cool muffins in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving.