Gather the ingredients.
Preheat the oven to 350°F. In a medium saucepan, melt the unsalted butter over moderate heat. Remove the saucepan from the heat and whisk in the light corn syrup and dark brown sugar, then whisk in the eggs until thoroughly blended.
Whisk in the vanilla extract and salt; stir in the pecans halves until combined.
Pour the pecan filling into the prebaked crust and bake for about 35 minutes, until the filling is set. Transfer the pan to a rack and let cool completely. Cut into bars and serve.
