In the bowl of a food processor, mix the peanut butter, butter, and sugar until smooth and well combined. Add the eggs one at a time, mixing well after each addition.In another bowl, mix the flour, baking powder, salt, and chopped peanuts. Incorporate this dry mixture into the butter preparation, then work until the dough is homogeneous.Shape the dough into a cylinder with a diameter of 9 cm, wrap in plastic wrap, and refrigerate for at least 2 hours.Slice the cylinder into 16 pieces and bake until the cookies are golden and slightly cracked on the surface.