@RobotDiver Not exactly a casserole, but an easy one-dish meal is to keep refried beans in the freezer so you can do a burrito bowl when avocados are on sale (they can get pretty expensive where I live).

Brown rice, refried beans, tomatoes, avocado, cheese, sour cream if you have it, maybe sweet potatoes and whatever other toppings you like. Throw it into a bowl, heat it up.

Bloody hell, what is even happening. Hope you're doing okay.