Preheat oven to 350 degrees and spray a 15x10x1" baking pan with cooking spray.
In a large mixing bowl, at medium speed, beat flour, butter, sugar, and salt until mixture resembles coarse crumbs. Dump into pan and press firmly and evenly across pan to form a crust.
Bake 20-25 minutes or until golden brown. Top with pecan filling.Bake an additional 25 minutes, or until filling is firm around edges and slightly firm in the center.
Cool completely on a wire rack before cutting into small pieces. Makes lots of bars. Enjoy!