Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving a slight overhang on the sides for easy removal later. Lightly grease the parchment with non-stick spray.
In a large bowl or food processor, combine the flour, granulated sugar, and salt. Add the cold, cubed butter. Pulse or use a pastry cutter until the mixture resembles coarse crumbs. Press this mixture firmly and evenly into the bottom of the prepared baking pan.
Place the crust in the oven and bake for 15 to 18 minutes, or until the edges are just starting to turn a light golden brown. Remove from the oven and set aside while you prepare the filling.
In a medium bowl, whisk together the eggs, corn syrup, brown sugar, melted butter, and vanilla extract until smooth. Stir in the chopped pecans until they are well-coated with the liquid mixture.
Pour the pecan mixture over the warm, par-baked crust, spreading it evenly to the edges. Return the pan to the oven and bake for another 25 to 30 minutes. The filling should be set around the edges but still have a very slight jiggle in the center.
Allow the bars to cool completely in the pan on a wire rack. While cooling, whisk together the powdered sugar, maple syrup, and milk in a small bowl until smooth. Once the bars are cool, drizzle the maple glaze over the top in a decorative pattern.
Using the parchment paper overhang, lift the entire block of bars out of the pan. Place on a cutting board and slice into 16 even squares or rectangles. Serve at room temperature.