Thick, gooey Levain-style cookies packed with dark chocolate and toasted walnuts. Crisp on the outside, molten in the center — just like the iconic NYC bakery favorite.
1 cup (2 sticks) cold unsalted butter, cubed
¾ cup brown sugar, packed
½ cup granulated sugar
2 large cold eggs
2¾ cups all-purpose flour
1 tbsp cornstarch
½ tsp baking soda
½ tsp baking powder
½ tsp kosher salt
2 cups dark chocolate chunks (60–70% cacao)
1½ cups toasted walnuts, roughly chopped
Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a stand mixer, beat cold cubed butter with sugars until just combined.
Add eggs one at a time, mixing briefly after each.
In a separate bowl, whisk flour, cornstarch, baking soda, baking powder, and salt.
Add dry ingredients to the butter mixture. Mix until dough just comes together.
Fold in chocolate and toasted walnuts by hand.
Divide dough into 6–8 large balls (about 6 oz each). Chill for 30–60 minutes.
Bake for 9–11 minutes until edges are golden and centers appear just set.
Cool on tray for 10 minutes before transferring.
Freeze dough balls for future baking.
Top with flaky sea salt for a gourmet twist.
Make smaller cookies for more servings; adjust bake time.