Preheat oven to 350°. In medium saucepan, melt butter over medium heat. Add brown sugar, apple juice, orange juice, vinegar, cinnamon, allspice, salt and nutmeg. Increase heat and cook until mixture simmers; remove saucepan from heat.
Spray 13 x 9-inch baking dish with cooking spray. Layer sweet potatoes, apples and juice mixture in baking dish. Cover with foil and bake 1 hour. Remove foil and bake 15 minutes longer or until potatoes are tender.