Step 1: Creaming the Butter and Sugars to Aerated Perfection
The foundation of any great gourmet cookie is the creaming process. Cut your cold butter into cubes and add it to your stand mixer along with the brown and white sugars. Beat on medium-high speed for 3 to 4 minutes. You are looking for a pale, fluffy, and aerated mixture. Pro Tip: Using cold butter instead of room-temperature butter prevents the cookies from spreading into thin puddles in the oven.Step 2: Incorporating the Wet Ingredients
Turn your mixer down to a low speed. Add your eggs one at a time, allowing the first to fully incorporate before adding the second. This emulsion process ensures a smooth dough. Pour in that generous tablespoon of pure vanilla extract. Scrape down the sides and bottom of the bowl with a silicone spatula to ensure no butter is left unmixed.Step 3: Whisking the Dry Ingredients
In a separate bowl, whisk together your flour, cornstarch, baking powder, baking soda, and salt. Gradually add this dry mixture to your wet ingredients, mixing on low speed until just combined. Do not overmix, as this will develop the gluten and result in tough cookies. Gently fold in your chocolate chips and chunks by hand.Step 4: Portioning and Chilling the Dough
To mimic that famous bakery size, use a ½ cup measuring scoop to portion out giant dough balls. Roll them gently to form a rough sphere—don't pack them too tightly; a little texture on the outside creates craggy, crispy edges. Place the dough balls on a baking sheet and chill them in the refrigerator for exactly 30 minutes.Step 5: The High-Heat Bake and Rest
Preheat your oven to 400°F (200°C). Unlike standard recipes that bake at 350°F, this high-heat burst shocks the dough, setting the outside quickly while keeping the inside beautifully underbaked and gooey. Bake for 12 to 14 minutes. The centers should still look slightly glossy and raw when you pull them out. Crucial Step: Let them rest on the hot baking tray for 10 to 15 minutes. The residual heat will finish cooking the centers perfectly.
