Ingredients
Method
- Brown the butter over medium heat until amber and nutty, about 7 minutes. Cool until warm.
- Whisk the warm brown butter with both sugars for 1 minute. Whisk in the egg, egg yolk, and vanilla until glossy.
- Fold in the flour, cornstarch, baking soda, and salt until no dry streaks remain.
- Stir in the chocolate, then cover and chill the dough for at least 30 minutes.
- Heat oven to 375°F (190°C). Scoop the cold dough into 3-tablespoon rounds, place 3 inches apart on parchment-lined sheets, and bake 12 to 13 minutes until edges are golden and centers look slightly underdone.
- Cool on the sheet 5 minutes, then transfer to a rack. Break one open warm to see the gooey center.
Notes
Chill the dough for at least 30 minutes for thickness; for the tallest cookies, chill for 1 to 2 hours or overnight. The dough balls go onto the sheet cold and rounded, never flattened. If baking from frozen, add 1 to 2 minutes.
