
Preheat the oven to 350°F. Spray a 9×13-inch baking dish with nonstick spray then line it with parchment paper or foil.
In a large bowl, whisk to combine the flour, sugar and salt. Drizzle in the melted butter and stir together with a fork. Use clean hands to mix and knead the dough together (it will be crumbly) then place it in the prepared baking dish. Press it into a thin, even layer.
Bake for 15 to 20 minutes or until the edges turn lightly golden.
While the shortbread crust bakes, in a large bowl, whisk to combine the eggs, corn syrup, brown sugar, vanilla and salt until smooth. Sift in the ⅓ cup flour and whisk to combine. Add the chopped pecans and mix once more.
When the crust comes out of the oven, pour the pecan pie topping over it and smooth out any piles of pecans. Return it to the oven for about 30 minutes or until the topping is puffed and dry.
Allow to cool completely and then chill slightly before cutting, in order to get nice clean pieces.