Whisk the egg and the sugar together until smooth.
Beat in the peanut butter, cocoa powder, baking soda and vanilla, if using.
Fold in the chips.
Scoop out onto an ungreased baking sheet about 2 inches apart. I use a 1 1/2 inch cookie scoop.
Flatten each ball just slightly with your fingers and bake for about 10 minutes. Cool for a few minutes on the pan, then transfer to a rack.
Notes
These cookies are great eaten right away, and will soften a bit upon storage. If you are going to store them, I recommend covering them loosely with foil, as plastic will make them too soft.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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