Prep Time 20 minutes mins
Cook Time 10 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr
Chilling helps preserve the marbled fudge ripples and prevents excessive spreading, so avoid skipping it. For chewier cookies, pull them from the oven when the centers still look a touch glossy; they’ll finish setting on the sheet. If you prefer larger bakery-style cookies, use a 3-tablespoon scoop and add 2 to 3 minutes to the bake time. Swap in milk or white chocolate chips for contrast, or add 1/2 teaspoon espresso powder to intensify chocolate flavor. Store cookies airtight at room temperature for up to 4 days or freeze dough balls for 2 months; bake from frozen adding 1 to 2 minutes.