Preheat the oven to 350°F (175°C). Place a baking sheet on the middle rack to catch any drips.
Whisk the sugars and melted butter together in a large bowl until combined.
Add corn syrup, eggs, and bourbon. Keep whisking until smooth and silky.
Stir in the pecans, making sure they’re evenly coated in the syrup mixture.
Pour the filling into your pie crust and give it a gentle shake to level it out.
Bake for 50–55 minutes, until the center is just barely set and the top is golden. You can tent the pie with foil halfway through if the crust is browning too quickly.
Cool completely on a rack before slicing. This gives the filling time to set up just right.