Preheat your oven to 350°F/177°C.
Combine the peanut butter, coconut sugar and salt in a small bowl and set it aside.
Take one Peanut's Bake Shop Midnight Chocolate Chunk Cookie Kit and add the little bit of oil and water called for on the package. Stir to combine.
Grab a mini muffin tin and add one tablespoon of cookie dough to twelve spots in the pan. Flatten the cookie dough with your finger tips so that it touches all sides.
Then, add one teaspoon of the peanut butter mixture to the center of each of those twelve spots.
Finally, add one more tablespoon of cookie dough to the top of each spot and then smooth over the surface.
Bake these little treats in your preheated oven for 13 - 15 minutes or until the cookie tops are matte rather than shiny.
Allow the cookie cups to cool for at least 30 minutes before attempting to remove them. At that point, using a butter or table knife, carefully loosen the cookies by sliding the knife around the edges, and then carefully use that knife to lift each one out of the tin.