I sometimes serve these snacks with drinks, cutting the mushrooms into wedges and inserting a cocktail stick into each one.
Simple, basic, and infinitely adjustable to one's own palate (by adding beans or asparagus instead of peas, or using cream of potato or celery soup instead of mushroom), and yet just about impossible to improve upon, this Campbell's recipe is the classic tuna casserole.
Slide vegetables in a food processor to make the soup come together quickly.