1. Peel bananas and cut in half crosswise, then cut each piece in half lengthwise. For each serving, lay 2 banana pieces against the sides of a shallow dish.
2. To make watermelon scoops use an ice cream scoop to create balls of watermelon. Remove seeds, if needed. Place a watermelon scoop at each end of the dish.
3. Fill the center space with berries.
4. Stir yogurt until smooth, spoon over the watermelon scoops .
5. Sprinkle with granola.