Prep Time 15 minutes mins
Cook Time 10 minutes mins
Resting Time 30 minutes mins
Total Time 55 minutes mins
For the softest texture, avoid overbaking; pull cookies when centers are pale and puffy as they continue to set while cooling. Using cornstarch and an extra yolk adds tenderness and chew, while a short chill prevents spreading. If your kitchen is warm, chill scooped dough balls instead of the whole bowl for faster turnaround. For bakery-style pools of chocolate, mix chips with chopped bar chocolate. A light sprinkle of flaky sea salt before baking highlights the chocolate. Store in an airtight container with a slice of bread to maintain softness, and rewarm for 10 seconds in the microwave to revive gooey centers.