First up: the drainers. These are the folks who want a casserole that holds its shape, not a soup. They open that can, give it a good shake, and let the liquid run down the sink like a tiny waterfall of regret.
Why bother? Because undrained beans release extra water as they bake. That turns your creamy mushroom sauce into a watery puddle. Nobody wants a casserole that requires a straw.
Draining also prevents a soggy, sad topping. Those crispy fried onions? They deserve a crunchy throne, not a swamp. Drain your beans, and your casserole will have texture that actually snaps.
Plus, here’s a secret: the liquid in the can is basically bean-flavored water. It adds zero flavor. You’re better off using that space in the dish for more cream of mushroom soup or a generous pile of cheese. Your taste buds will high-five you.