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HEAT grill to medium-high heat.
BRUSH margarine onto both sides of tortillas; sprinkle evenly with combined sugar and cinnamon. Stack tortillas on microwaveable plate; cover with paper towel.
PEEL bananas; cut lengthwise in half. Grill 3 to 4 min. on each side or until warmed and slightly browned. Meanwhile, microwave tortillas on HIGH 30 to 40 sec. or just until warmed.
PLACE bananas on tortillas; top with COOL WHIP. Fold in half.