Ingredient:

• 10 tablespoons unsalted butter, cut into ½-inch slices
• 1 ¼ cups cane sugar
• ¾ cup natural unsweetened cocoa powder
• ½ teaspoon fine sea salt
• ¼ teaspoon baking powder
• ½ teaspoon espresso powder or very finely ground coffee (optional)
• 2 cold large eggs
• 1 ½ teaspoons vanilla extract
• ⅔ cup white whole wheat flour or flour of choice
• 2 ounces dark or semi-sweet chocolate, roughly chopped, or ⅓ cup chocolate chips