Preheat the oven to 350°F and generously coat a 12×17-inch rimmed baking sheet with nonstick cooking spray.
Stack the pie crusts on a lightly floured surface and roll them together into a large rectangle about 15×20 inches, blending the seams as you roll.
Transfer the dough to the prepared baking sheet and press it into the bottom and up the sides, trimming excess dough and patching gaps so the crust is sealed.
Spread the pecan halves evenly over the bottom of the crust and set the pan aside.
Cream the softened butter and the brown sugar in the bowl of a stand mixer fitted with the paddle attachment until smooth and fluffy, scraping the bowl as needed.
Add the eggs one at a time, mixing well after each addition.
Mix in the vanilla, the corn syrup, the cornstarch, and the bourbon if using until the filling is smooth and fully combined.
Pour the filling slowly over the pecans and gently tap the pan on the counter so the mixture settles between the nuts.
Bake for 50 to 60 minutes until the edges are browned and the center is set with a slight jiggle, loosely tenting the edges with foil if the crust browns too quickly.
Cool the pie completely in the pan before slicing so the filling fully sets.