Preheat your oven to 350°F (175°C) to ensure it's ready to bake the Pecan Pie Bars evenly.

Line an 8x8-inch baking pan with parchment paper, allowing a bit of an overhang on the sides.

In a mixing bowl, combine all-purpose flour and granulated sugar until well blended. Then, add softened unsalted butter, mixing until the texture resembles coarse crumbs.

Take the crumb mixture and press it firmly into the bottom of your prepared pan, creating an even layer. Bake this crust in the preheated oven for 15 minutes.

While the crust bakes, prepare the filling by mixing packed light brown sugar, granulated sugar, and salt in a separate bowl. Whisk in the large eggs one at a time.

Once your filling mixture is smooth, stir in the chopped pecans and vanilla flavoring until fully incorporated.

Carefully pour the pecan filling over the hot, baked crust, spreading it evenly with a spatula. Return the pan to the oven and bake for an additional 25 to 30 minutes.

Once baked, remove the pan from the oven and let it cool in the pan for about 10 minutes. Use the parchment paper to lift the Pecan Pie Bars out onto a cooling rack.