Preheat oven to 350 degrees. Spray 8×8″ baking pan with non-stick cooking spray.
In small bowl, combine the pouch of crust mix from the box with softened butter and 1/2 c. finely chopped pecans. Use a pastry blender or fork to combine until mixture is crumbly. Spread in prepared pan and press firmly into bottom of pan.
Bake about 10 minutes, then remove from oven.
Sprinkle over crust the packet of pecans from the mix, plus an additional 1/2 C. pecans and the chocolate chunks.
In small bowl, combine pouch of filling mix from the box with egg, bourbon and water. Whisk to mix well and immediately pour over crust/pecan/chocolate.
Bake additional 28 minutes or until center is set and top is lightly browned.