Chocolate Chip Cookies

Steps

1. Heat the oven to 350°F and line two sheets with parchment.
2. Whisk the butter, both sugars, egg, yolk and vanilla.
3. Stir in the flour, cornstarch, baking soda and salt until just combined. Fold in the chocolate.
4. Scoop tablespoon-size balls 2 inches apart.
5. Bake 10 to 11 minutes until the edges are golden. Cool on the pan 5 minutes.

Keeping and reheating

Store covered at room temperature for up to 2 days unless the recipe uses cream or fresh fruit; then refrigerate.