Cut three 25x3-in. strips of heavy-duty foil; crisscross so they resemble spokes of a wheel. Place strips on the bottom and up the sides of a 4- or 5-qt. slow cooker. Coat strips with cooking spray.
In a large bowl, combine the first nine ingredients. Crumble beef and sausage over mixture and mix well (mixture will be moist). Shape into a loaf. Place meat loaf in the center of the strips.
In a small bowl, combine sauce ingredients. Spoon over meat loaf. Cover and cook on low 3-4 hours or until no pink remains and a thermometer reads 160°. Using foil strips as handles, remove the meat loaf to a platter.