In the bowl of a stand mixer fitted with a paddle attachment, cream together the butter and peanut butter on medium speed for 2-3 minutes.
Add the sugars and continue beating for 2-3 more minutes until light & fluffy.
Beat in the egg and vanilla until fully combined.
Add the flour, baking soda, and salt. Mix the baking soda in with the flour to break it up.
Mix on low speed until just combined.
Lastly, fold in the chopped chocolate with a rubber spatula.
Cover the bowl and place in the fridge for at least one hour or overnight.
Once the dough has chilled, preheat the oven to 350 degrees F (180 degrees C) and line two baking sheets with aluminum foil or parchment paper.*
Use a 2 tablespoon cookie scoop to portion the cookie dough.
Roll each cookie dough ball in granulated sugar and top with more chopped chocolate.
Place the cookie dough on the prepared baking sheets about 3 inches a part.
Bake the cookies for 8 minutes, then remove from the oven (close the door) and drop the baking sheet onto a towel-covered countertop about 5-6 times.
Place the cookies back in the oven for an additional 3-4 minutes.*
Allow cookies to cool completely on the baking sheet and enjoy!