Ingredients:
- 10 tablespoons unsalted butter, cut into ½-inch slices
- 1¼ cups pure cane sugar
- ¾ cup natural unsweetened cocoa powder
- ½ teaspoon fine-grain sea salt
- ¼ teaspoon baking powder
- ½ teaspoon espresso powder or very finely ground coffee (optional)
- 2 cold large eggs
- 1½ 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