Food & Cooking Recipes Dessert & Treats Recipes Brownie Recipes Triple-Chocolate Brownies 3.7 (71) 2 Reviews 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 June 12, 2017 Print Rate It Share Share Tweet Pin Email Prep Time: 15 mins Total Time: 40 mins Yield: 16 Pureed black beans replace some of the butter used in brownies. Their earthy flavor and dark color are great matches for chocolate. Ingredients ¼ cup (½ stick) unsalted butter, plus more for baking pan ¼ cup black beans, rinsed, drained, and pureed until completely smooth 3 ounces semisweet chocolate, chopped (½ cup) 2 ounces unsweetened chocolate, chopped (⅓ cup) 1 ⅓ cups sugar 2 large eggs, plus 1 large egg white 1 ½ teaspoons pure vanilla extract 1 cup all-purpose flour (spooned and leveled) ¼ cup unsweetened cocoa powder ½ teaspoon baking powder Directions Preheat oven to 350 degrees. Lightly butter a 9-inch square baking pan and line with parchment paper, leaving a 2-inch overhang on all sides. In a large microwave-safe bowl, combine butter, bean puree, and chocolates and microwave in 30-second increments, stirring each time, until melted and smooth, about 2 minutes. Whisk in sugar, eggs and egg white, and vanilla until smooth. In a small bowl, whisk together flour, cocoa powder, baking powder, and salt. Stir into chocolate mixture until just combined. Pour batter into pan; smooth top. Bake until top is cracked and a toothpick inserted in center has moist crumbs attached, about 25 minutes (center will seem undercooked but will set further as it cools). Let cool completely in pan on a wire rack. Using parchment, lift brownie from pan and cut into 16 squares. Scheimpflug Digital Cook's Notes Nut lovers can add 1/2 cup chopped walnuts to the brownies. Walnuts pack a good dose of heart-healthy omega-3 fatty acids as well as protein and fiber. Store brownies in an airtight container, up to 3 days. Rate it Print