Preheat oven to 350 degrees.
In a large bowl, combine the peanut butter, sugar, egg and protein powder.
Fit a large, rimmed baking sheet with parchment.
Divide the mixture into 12 balls
Place on parchment. Using the tines of a fork, flatten into a disc. Turk the fork to create a criss-cross pattern.
Place the chocolate in the middle of the cookies.
Bake 10-12 mins or until golden brown.
Season with a bit of salt and let cool on a cooling rack.