Makes one 9-inch skillet cookie, 12 servings Ingredients 1/2 cup (115g) salted butter, softened1/2 cup (100g) granulated sugar1/2 cup (100g) brown sugar1 teaspoon vanilla extract1/8 teaspoon peppermint extract1 large egg1 cup (125g) all-purpose flour2/3 cup (60g) cocoa powder1 1/2 teaspoons ...