Ingredients
Method
- Preheat your oven to 410°F (210°C). Use the middle rack and lower temperature slightly if your oven runs hot.
- Cream the cold butter cubes, brown sugar, and white sugar in a large bowl using a mixer for about 4 minutes until light and fluffy. Scrape down the sides.
- Add eggs one at a time, plus vanilla if using. Beat for 1 minute until smooth.
- Add flour, cornstarch, baking soda, and salt. Mix gently until just combined—do not overmix.
- Fold in both types of chocolate chips by hand or on low speed until evenly distributed.
- Scoop dough into large 6 oz balls (or smaller if preferred). Space them apart on the sheet.
- Line a light-colored baking sheet with parchment paper. Place dough balls on the tray with space between.
- Bake for 9–12 minutes until edges are golden brown and centers still appear soft.
- Let cookies rest on the baking sheet for 10–15 minutes before transferring.
- Once cooled, store in an airtight container for up to 5 days.
Notes
Use a kitchen scale for flour for best accuracy. Avoid dark pans to prevent burnt bottoms. Resting after baking keeps the centers gooey. You can freeze both dough and baked cookies easily.
