01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a large mixing bowl, beat together softened unsalted butter and granulated sugar until light and fluffy.
03 - Add flour and salt to the butter-sugar mixture, mixing until the dough is crumbly and well combined.
04 - Evenly press the dough into the prepared pan. Bake for 18 to 20 minutes, until lightly golden.
05 - While the crust bakes, whisk eggs, brown sugar, corn syrup, flour, and salt in a medium bowl until smooth. Mix in melted butter, bourbon, and vanilla, then fold in chopped pecans.
06 - Spread the pecan mixture evenly over the hot crust.
07 - Return pan to the oven and bake for 25 to 28 minutes, until filling is set and golden brown.
08 - Let bars cool completely in the pan on a wire rack. Use the parchment overhang to lift out, then cut into bars.