Preheat oven to 350 degrees F. and line a large baking sheet with non-stick cooking spray.
Place peanut butter and powdered sugar into a large bowl and mix to combine. I used my hands for a quicker mix. Press into an 8x8 inch baking pan that has been lined with foil, sprayed with cooking spray. Place in freezer for at least 30 minutes.
Place butter and sugars into the bowl of a stand or electric mixer, mix to combine. Add eggs and vanilla, mix to combine.
Place flour, salt and baking soda into a large bowl, mix to combine. Slowly add to wet ingredients along with chocolate chips, just mixing until combined.
Remove peanut butter truffle pan from freezer and cut into cubes. They will not be perfect, I even tore some apart with my hands. Just as long as they are in chunks, you are fine. Once cut up, I put back in freezer for about 10 minutes.
Add peanut butter truffle chunks to your cookie dough, mix on low for just a couple turns of the mixer, the idea is you want chunks and swirls throughout the dough so you bite into nice bits of peanut butter truffle :)
Scoop dough onto prepared baking sheet about 1 inch apart and bake for 10-13 minutes, until cooked to your preference. Let cool for 10 minutes on baking sheet then transfer to cooling rack to cool completely.