Preheat oven to 350?F. Spray a 9-inch square baking dish with nonstick spray. Place apple slices in pan and pour apple juice over the top. In a small bowl, combine brown sugar, cinnamon and allspice; toss with apples until evenly coated. Dot the top with butter and sprinkle granola evenly over the top. Bake for 25 minutes. Serve warm with a scoop of vanilla ice cream.