Preheat oven to 350 F degrees. Spray a deep 9x13 inch pan or line it with parchment paper.

In a large bowl, empty the contents of the box of angel food cake and to it add the crushed pineapple. Whisk it until it's well incorporated, you'll notice it start to foam a bit.

Pour the batter in the baking pan and bake for 30 to 40 minutes. I baked mine closer to 40 minutes, at 30 minutes it was not yet done.