Roughly chop up the 4 squares of chocolate and place with the peanuts in a small food processor. Whiz until the peanuts are in small pieces. Add the cocoa nibs and set aside.
Sift the peanut flour, salt, and baking soda into a small bowl (I just put through a small mesh strainer into the bowl, using a spoon to gently push it through).
In a medium bowl blend the peanut butter and butter until silky smooth. Add the Stevia and blend for about 3 minutes until smooth and fluffy. Add the vanilla and egg and blend.
Add the dry ingredients in batches. Its a very fine powder texture so would just billow out of your bowl if dumped in all at once.
Fold in your nuts and chocolate bits mixture.
Form 1 to 1 1/2" balls and place on a silpad (or ungreased) cookie sheet. Press gently with a fork then turn the fork 90° and press down a little more to get the classic crosshatched look.
Bake for 10-12 minutes at 325°F.
Remove cookie sheet from oven and let cool for a couple minutes. Gently remove the cookies to a cooling rack and let complete cooking.
Notes
I didn't have presoftened butter, so just nuked the butter until it was soft with just a bit of melted butter. I like the texture it created versus just a softened butter.