Place meat in roasting pan sprayed with cooking spray; brush with 1/2 cup dressing. Toss potatoes and beets with 2 Tbsp. of the remaining dressing; spoon around meat.
Bake 15 min.
Toss onions and carrots with remaining dressing.
Add to ingredients in roasting pan.
Bake 1 hour or until meat is done (145F), basting occasionally with pan juices.