Ingredients
Equipment
Method
- Preheat oven to 350°F (175°C). Grease a 12-inch pizza pan or 9-inch round cake pan.
- Cream softened butter, brown sugar, and granulated sugar until fluffy (2-3 mins).
- Beat in egg, egg yolk, and vanilla until combined.
- Whisk flour, cornstarch, baking soda, and salt. Gradually add to wet ingredients, mixing until just combined.
- Fold in chocolate chips. Spread dough onto prepared pan, leaving 1 inch of space around edges.
- Bake for 18-22 minutes until edges are golden and center is set but soft.
- Cool completely before decorating with frosting.
Notes
Do not overbake, or the cookie will become hard. The center should look slightly underdone when removing from the oven.