layer of oil so the bars release easily.
In a large mixing bowl, add the entire box of dry angel food cake mix. Do not add water or any ingredients listed on the cake mix box—Nana’s secret is using just the dry mix and pineapple.
Pour the entire can of crushed pineapple with its juice into the bowl with the cake mix. The pineapple juice replaces all the usual liquids and makes the batter light and fluffy.
Stir the mixture together by hand with a spatula or wooden spoon until it’s fully combined. The batter will foam up a bit and look airy and thick with visible pineapple pieces, which is exactly what you want.
Pour the batter into the prepared glass casserole dish and spread it into an even layer, smoothing the top so it bakes evenly and browns nicely.
Bake on the center rack of the preheated oven
