Ingredients Meat & Poultry Beef Recipes Ground Beef Recipes Meatloaf and Buttermilk Mashed Potatoes 3.1 (66) 10 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 May 16, 2017 Print Rate It Share Share Tweet Pin Email Prep Time: 30 mins Total Time: 1 hrs Our comforting menu of meatloaf and buttermilk mashed potatoes is as hearty as the diner original -- but better for you. Panko is sold in many international aisles; regular breadcrumbs can be swapped in, too. Ingredients 2 small carrots, chopped 2 celery stalks, chopped ¼ medium onion ¼ cup panko (Japanese breadcrumbs) 1 large egg white ¾ pound ground beef sirloin Coarse salt and ground pepper ¼ cup homemade or store-bought barbecue sauce 1 pound baking potatoes, peeled and sliced ½ inch thick ¾ cup low-fat buttermilk 1 pound green beans, stem ends removed 1 teaspoon olive oil Directions Preheat oven to 450 degrees. In a food processor, chop carrots, celery, onion, and panko with egg white until smooth, about 1 minute. Transfer to a large bowl; mix in beef, 1 teaspoon salt, and 1/8 teaspoon pepper. On a foil-lined baking sheet, form meat mixture into a 6-inch-long loaf; brush with half the barbecue sauce. Bake until an instant-read thermometer inserted in loaf registers 160 degrees, 25 to 30 minutes, brushing halfway through with remaining sauce. Meanwhile, in a medium saucepan, cover potatoes with cold salted water by 1 inch. Bring to a boil; reduce to a simmer, and cook until potatoes are easily pierced with a knife, 15 to 20 minutes. Drain; return to pan. Stir over medium until a starchy film forms on bottom of pan, about 1 minute. Remove from heat; mash with buttermilk until smooth. Season with salt and pepper. While potatoes cook, set a steamer basket in a saucepan filled with one inch water; bring to a gentle boil. Add green beans; cover, and cook until crisp-tender, 4 to 6 minutes. Transfer to a bowl; add oil, season with salt and pepper, and toss. Serve meatloaf with mashed potatoes and green beans. Rate it Print