01 -
Preheat the oven to 350°F (175°C). Microwave the butter for about 40 seconds until just barely melted. It should be mostly in liquid form but not hot.
02 -
Using a stand mixer or electric beaters, cream together the melted butter with both sugars until smooth. Add the vanilla and egg, beating on low speed for just 10-15 seconds until incorporated. Do not overbeat the egg.
03 -
Add the flour, baking soda, and salt. Mix until crumbles form. Use your hands to press the crumbles together into a cohesive dough ball that holds together well.
04 -
Fold in the chocolate chips and chunks with your hands until evenly distributed throughout the dough.
05 -
Divide and roll the dough into 12 large balls (or 9 for extra-large cookies) and place on a baking sheet. Bake for 9-11 minutes until the cookies look puffy, dry, and just barely golden around the edges. Do not overbake, even if they appear underdone.
06 -
Allow cookies to cool on the baking sheet for 30 minutes. They will sink slightly and develop a dense, buttery texture as they cool. Store in an airtight container to maintain softness for several days, or freeze for longer storage.