Preheat oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, leaving an overhang on the sides.
For the crust, whisk together flour, sugar, and salt in a medium bowl. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
Press the crust mixture evenly into the bottom of the prepared baking pan.
Bake the crust for 15-18 minutes, or until lightly golden. Remove from oven and let cool slightly.
For the filling, in a large bowl, whisk together eggs and brown sugar until well combined.
Stir in the corn syrup, melted butter, and vanilla extract.
Fold in the chopped pecans.
Pour the filling evenly over the partially baked crust.
Bake for another 25-30 minutes, or until the filling is set and the edges are golden brown.
Let the bars cool completely in the pan on a wire rack before cutting into squares.
Notes
For best results, ensure all ingredients for the crust are cold.