Cook rice mix according to package directions.
Cook sausage and ground beef in a large skillet, stirring until it crumbles and is no longer pink. Drain and pat dry with paper towels. Cook onion and mushrooms in same skillet over medium heat 7 minutes or until tender, stirring occasionally.
Combine rice, sausage and beef, onion and mushrooms, water chestnuts, parsley, and soy sauce; stir well. Spoon mixture into an ungreased 13" x 9" baking dish. Cover and chill casserole overnight.
Remove from refrigerator, and let stand at room temperature 30 minutes. Sprinkle with almonds. Bake, uncovered, at 350° for 40 minutes or until thoroughly heated.
Note: You don't have to refrigerate the casserole overnight. Just spoon it into the baking dish and bake, uncovered, at 350° for 20 minutes or until heated.