Preheat oven to 350°F.
In a large mixing bowl, combine the angel food cake mix and the entire can of crushed pineapple (with juice).
Mix until fully blended and fluffy.
Pour the mixture into an ungreased 9x13-inch baking dish.
Bake for 30–35 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean.
Cool completely before serving. Optional: Top with whipped cream or fresh fruit.