Disclaimer: I’m only giving you the amounts for one casserole, but I always double this recipe for three reasons – #1 This recipe is too good and takes too much prep time to only have 1 batch. #2 I use ½ container of two different kinds of mushrooms, and I don’t want to have leftover mushrooms to try and fit in other dishes. If you eat lots of mushrooms, then that won’t be an issue for you. Of course, if you don’t want to double the recipe and don’t eat a lot of mushrooms, just use one package of one kind – problem solved! #3 I use only ½ can of two different kinds of beans, and like the mushrooms, I don’t want to have leftovers or waste. Again, if you only want one casserole, you can either use the rest of the beans for something else like burritos, or just use two types of beans.