Prepare cookie sheet with parchment paper and Preheat Oven to 350 F (175 C).
Combine flours, baking powder, and salt by whisking together in a medium bowl, then set aside. (Sift Flour to prevent any lumps)
In bowl of stand mixer with whisk attachment or large bowl using hand mixer, cream together butter and peanut butter.
Make sure to scrape down the sides and bottom of the bowl throughout mixing to incorporate all ingredients.
Add sugar, brown sugar, egg, and vanilla to the butter mixture. Incorporate on medium high until blended.
Slowly spoon in flour mixture at a lower speed, then turn back to medium high to form cookie dough.
Fold in chocolate chunks with a spatula.
Take a 2 Tbsp Ice Cream Scoop and measure out cookie dough balls.
Place 0.5-1 inches apart on cookie tray.
Gently press the top of each cookie down with a fork.
Bake 12-15 minutes until cookies are starting to brown on top. (DO NOT over cook or they will loose their gooeyness).
Place tray on cooling for 10 minutes before eating.