Heat oven to 350°F. Line a 9x13-inch pan with parchment, leaving a little overhang for easy lifting, or spray with cooking spray.
In a bowl, whisk flour, sugar, and salt. Cut in the cold butter until the mixture looks like coarse crumbs and holds together when pressed.
2 cups all-purpose flour, ½ cup granulated sugar, ½ teaspoon salt, 1 cup unsalted butter
Press evenly into the pan. Bake for 15 minutes; it should look set but pale.
In a large bowl, whisk eggs, corn syrup, brown sugar, melted butter, vanilla, and salt until smooth. Fold in the pecans.
4 large eggs, 1 ⅓ cups light corn syrup, 1 cup light brown sugar, 3 tablespoons unsalted butter, 1 ½ teaspoons vanilla extract, ¼ teaspoon salt, 3 cups chopped pecans
Pour the filling over the hot crust. Bake for 30 to 35 minutes, until the center is just set with a very slight jiggle. Rotate the pan once halfway. If the top browns early, tent loosely with foil.
Cool completely on a rack, then chill for at least an hour for the cleanest cuts. Lift out and slice into bars.