Food & Cooking Recipes Dessert & Treats Recipes Chocolate Frosting for Surprise Cookies Be the first to rate & review! By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on May 16, 2017 Print Rate It Share Share Tweet Pin Email Use this frosting when making our Surprise Cookies. Ingredients 2 cups confectioners' sugar 4 tablespoons (½ stick) unsalted butter, melted and cooled ¼ cup cocoa powder ¼ cup milk ¼ teaspoon pure vanilla extract Directions Place confectioners' sugar in a medium bowl. In a small saucepan over medium-low heat, melt butter with the cocoa, stirring occasionally with a wooden spoon. Add milk and vanilla, and whisk. Rate it Print