Place a teaspoon of nutella in the center of the won ton wrapper with a slice of banana.
Moisten the edges with a finger dipped in water. Fold diagonally and completely seal edges together.
Slowly drop the won ton wrappers, a few at a time in hot oil, turn them over and fry them till lightly browned. Remove them from the oil and drain on paper towels, sprinkle with powdered sugar. Serve warm.