Preheat oven to 350°F (175°C). Lightly grease a 9×13 inch baking dish.
Arrange sliced bananas evenly in the bottom of the baking dish. Spread drained crushed pineapple over the bananas, then add strawberry pie filling on top. Smooth each layer for even distribution.
Sprinkle dry yellow cake mix evenly across the fruit layers without mixing. Ensure the surface is completely covered.
Slowly drizzle melted unsalted butter over the entire surface of the cake mix, covering as much as possible for an even golden crust.
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