Preheat oven to 350°F and line a 9×13 pan with parchment.
Mix flour, sugar, salt; cut in cold butter until crumbly.
Press into pan and bake for 20 minutes.
Whisk eggs, corn syrup, sugars, butter, and vanilla.
Stir in chopped pecans.
Pour over baked crust.
Bake another 25–30 minutes.
Cool completely before slicing into bars.
