Heat the oven and line the pan: Heat oven to 350°F. Line a 9x13-inch pan with parchment, leaving an overhang.
Make the crust: Cream the butter and brown sugar until fluffy. Mix in the flour and salt until crumbly.
Press and bake the crust: Press the crust evenly into the pan. Bake 20 minutes until pale golden.
Make the filling: Whisk the eggs, corn syrup, brown sugar, melted butter, vanilla, and salt. Stir in the pecans.
Fill and bake: Pour the filling over the hot crust. Bake 25–30 minutes until the edges are set and the center still trembles slightly.
Cool, chill, and cut: Cool completely, then chill at least 1 hour before lifting out and cutting.