Chocolate-Peanut Butter Swirl Cookies

These are like those three-ingredient peanut butter cookies everyone loves, but with a little cocoa powder and bittersweet chocolate threw in to make them fancy. You only need five ingredients and a bit of elbow grease to put them together. While semisweet chocolate (in bar or chip form) would certainly work here, bittersweet chocolate is a better choice. The darker chocolate, along with the cocoa powder, adds a fruity bitterness that contrasts nicely with the sweet peanut butter.