Preheat the oven to 350ºF. Line a 9x13 baking dish with aluminum foil and spray with cooking spray.

In the bowl of a stand mixer fitted with the paddle attachment, cream together butter and sugars on medium speed until light and fluffy, about 3 minutes. With the mixer on low, add the vanilla and mix. Add the eggs one at a time, scraping the bowl between each addition, and mix on low until incorporated.

In a small bowl combine the flour, baking soda, and a pinch of salt. Add a little at a time to the butter mixture, mixing until just incorporated.

Remove the bowl from the stand mixer and fold in the chocolate chunks and chocolate chips with a rubber spatula. Pour the batter into the prepared pan and smooth the top. Sprinkle evenly with a few more pinches of salt. Bake 30 minutes or until a toothpick inserted in the center comes out clean. Allow to cool completely before removing from the pan and cutting into squares. Store leftover bars wrapped tightly in plastic wrap in the refrigerator.