Preheat the oven to 350°F (175°C) and line a 9x13-inch baking dish with parchment paper.
In a medium bowl, mix the flour, softened butter, and sugar until the mixture resembles coarse crumbs.
Press the crust mixture evenly into the bottom of the prepared baking dish.
Bake the crust for 15 minutes, or until lightly golden. Set aside to cool slightly.
In a large bowl, whisk together the eggs, corn syrup, brown sugar, bourbon, melted butter, vanilla extract, and salt until well combined.
Stir in the chopped pecans.
Pour the pecan mixture over the partially baked crust, spreading evenly.
Bake for an additional 25 minutes, or until the filling is set and golden brown.
Allow the bars to cool completely in the pan on a wire rack before cutting into squares.