Preheat your oven to 350°F (180°C), or 160°C for a fan oven. And spray a 9x9 baking pan with baking spray and line it with parchment paper. Set aside.
In a medium bowl, combine the flour, sugar, and melted butter. Fold until a dough forms.
Press the dough into the bottom of the prepared pan to form the crust.
Bake for 18-20 minutes or until lightly browned.
Remove from the oven and allow to cool while you prepare the pecan filling.
In a large bowl, whisk together the melted butter, eggs, vanilla extract, corn syrup, and brown sugar until combined. Fold in the pecans last.
Pour the filling on top of the shortbread crust and bake for 35-40 minutes or until the edges are set and the center slightly jiggles.
Remove from the oven and allow to cool completely on a wire rack before trying to remove and cut.