"I’ve always loved peanut butter cups, especially the filling, and I set out to make cookies that taste like the inside of a peanut butter cup. Nutritional yeast is the secret ingredient that gives the cookies inside-of-a-peanut-butter-cup authenticity. It adds a salty-and-sweet element and an imperceptibly cheesy flavor. The cookies will still 'turn out' without it but a key flavor element will be absent. The cookies are super soft, moist, slightly chewy, not overly sweet, and loaded with big, rich, bold peanut butter cup flavor...."