Set out the pie crust atop a cookie sheet. Chop up the York patties and place half of them in the crust.
In a medium sauce pan, place the milk, butter, and cocoa powder. Warm on low heat. Stir occasionally so the mixture doesn't stick and scorch. Remove from heat when all ingredients are melted and mixed together fully. Set aside to cool for 15 minutes.
Preheat the oven at 350-degrees.
In a large bowl, lightly beat the three eggs. Temper them by adding a couple spoonfuls of the chocolate mixture and mixing. Do this three times. Finally, stir the remaining chocolate into eggs.
Add the flour, espresso powder, vanilla extract, and peppermint extract. Fold in chocolate chips.
Pour brownie batter into the pie shell and then top with remaining chopped York Patties.
Bake for 30-40 minutes on the cookie sheet, until a knife in the center comes out clean. Let set to cool for several hours. Store covered with foil in the fridge.
OM NOM NOM!