Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish.
Layer the fruit: Spread sliced bananas, drained pineapple, and sliced strawberries evenly in the dish.
Add the cake mix: Sprinkle the dry cake mix evenly over the fruit layer.
Drizzle with melted butter: Pour butter over the cake mix, making sure to cover as much as possible.
Bake for 35-40 minutes, or until the top is golden brown and bubbling.
Let cool slightly, then top with whipped cream, fresh fruit, chopped nuts, and a drizzle of chocolate syrup.
Serve warm or chilled for a delicious, easy dessert!