Pierre Hermé & Dorie Greenspan's World Peace Cookies

INGREDIENTS

• 1/3 cup unsweetened cocoa powder
• 1 1/4 cup all-purpose flour
• 2/3 cups (packed) light brown sugar
• 5 ounces bittersweet chocolate, chopped into chips, or a generous 3/4 cup store-bought mini chocolate chips
• 1 stick plus 3 tablespoons (11 tablespoons) unsalted butter, room temperature
• 1/2 teaspoon baking soda
• 1/4 cup granulated sugar
• 1 teaspoon pure vanilla extract
• 1/2 teaspoon fleur del sel or 1/4 teaspoon fine sea salt