Cook juices in a medium-size nonstick skillet over medium heat, stirring occasionally, 14 to 16 minutes or until mixture is reduced to 3/4 cup. Remove from skillet.
Melt buttery spread in skillet over medium-high heat; add brown sugar, and cook, stirring often, 2 minutes. Add bananas; cook, stirring occasionally, 2 minutes. Stir in vanilla and cinnamon. Add juice mixture, and cook, stirring occasionally, 1 minute. Serve over frozen yogurt, and top with chopped nuts.