Prep Time 20 minutes mins
Cook Time 10 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr
Chilling helps preserve the fudge swirl and prevents excess spread, so don’t skip it; for distinct ribbons, under-fold the chocolate and stop as soon as you see visible streaks. If your peanut butter is natural and runny, stir well and consider adding 1 to 2 tablespoons more flour to compensate. Swap semisweet for dark or milk chocolate to taste, and add chopped roasted peanuts for crunch. Bake to just-set edges for a chewy center, remembering cookies continue to firm as they cool. Store airtight at room temperature for 3 days or freeze dough scoops up to 2 months, baking from frozen and adding 1 to 2 minutes to the time.