Add the all-purpose flour, granulated sugar, baking powder, and table salt to the bowl of a food processor. Pulse 3 times to combine the ingredients.
Add the very cold butter pieces and pulse at one-second intervals until the butter is mixed in.
Add the egg and pulse until the dough forms a ball on the blade of the processor
Turn the dough out of the food processor onto a floured surface, and carefully remove the blade.
Flatten the dough into a disc. Wrap with plastic wrap and chill for 15-20 minutes.
Roll out pie dough on a lightly floured surface.
Place the dough into a pie pan. Crimp the edge, and refrigerate until needed.
Preheat oven to 350ºF.
Add the melted butter, brown sugar, eggs, and vanilla extract to the bowl of a stand mixer, fitted with the paddle attachment (or a large bowl and an electric hand mixer). Whip until thick and creamy.
Add the flour and salt to the bowl and mix until just combined. Scrape the sides and bottom of the bowl.
Add the bourbon to the batter and mix to combine.
Add chopped pecans and chocolate chips to the mixture and stir to combine.
Pour the batter into the pie crust and smooth into an even layer with a rubber spatula.
Place the pie plate on the center rack of the preheated oven and bake for 50-55 minutes. It may be slightly jiggly in the middle.
Remove the pan from the oven and place it on a wire rack to cool completely.
When cooled, slice and serve with whipped cream.,