Creamy chicken tetrazzini is the kind of casserole made for chilly evenings, Sunday dinners, potlucks, and nights when leftover chicken needs a particularly delicious second act. Tender chicken, mushrooms, spaghetti, peas, and Parmesan are folded into a creamy homemade sauce, then baked beneath mozzarella and buttery Parmesan breadcrumbs until everything is bubbling and golden. Despite …
