Step 1

Preheat the oven to 350°F (177°C). Spray a 9 X 13-inch baking dish with nonstick cooking spray.

Step 2

Spread both cans of pineapple evenly in the bottom of the prepared baking dish.

Step 3

Sprinkle brown sugar (1/2 cup) evenly over pineapple.

Step 4

Evenly spread cake mix (1 box) over the top of the filling and press down firmly. Arrange butter slices (24 slices) evenly over the cake mix.

Step 5

Bake in the preheated oven for 50-60 minutes, or until the top is deep golden brown and bubbly. Let set for a few minutes and serve.