Bakery-style Levain Chocolate Walnut Cookies — ultra-thick, gooey-centered, and loaded with melty chocolate chunks and toasted walnuts.
1 cup (2 sticks) cold unsalted butter, cubed
¾ cup brown sugar, packed
½ cup granulated sugar
2 large cold eggs
1 tsp vanilla extract
2½ cups all-purpose flour
1 tbsp cornstarch
½ tsp baking powder
½ tsp baking soda
½ tsp salt
2 cups semisweet chocolate chunks
1½ cups walnuts, toasted and chopped
Preheat oven to 400°F (205°C). Line baking sheets with parchment.
In a bowl, whisk flour, cornstarch, baking powder, baking soda, and salt.
In a mixer, cream cold butter with sugars until just combined.
Add eggs and vanilla. Mix until incorporated.
Add dry ingredients in batches. Stir until dough comes together.
Fold in chocolate and walnuts.
Portion into 6 oz dough balls. Chill for 30–60 minutes.
Bake 10–12 minutes, until golden on edges and soft in center.
Cool on tray 10 minutes before transferring.
Use cold ingredients for best height. Toasting walnuts adds flavor. Store at room temp or freeze for up to 3 months.