1. Drain the pineapple for firmer bars and less seepage. Use white or pineapple cake mix for a lighter flavor. Add 1/2 cup quick oats to the dry cake mix for extra crunch. If dry spots remain after baking drizzle 2 tbsp more melted butter and return to oven 5 minutes. Store covered 1 day at room temperature or refrigerate up to 5 days