How to Make It
Preheat the oven to 350°. 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 and stir in the pecans halves until combined.
Pour the pecan filling into the prebaked pie bar 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.
The largest pecans, called mammoth, make a striking presentation. Look for them (approximately 200 to 250 halves per pound) in specialty food shops. Get the Baked Press-in Crust recipe here.