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A balanced casserole typically includes a protein (beef, chicken), vegetables , a binding sauce (cream of mushroom, cheese), grains/starches (pasta, rice, potatoes), and a topping (breadcrumbs, extra cheese).
If your interest is in the culinary "casserole," here is a quick guide to what makes a complete dish:
7 Super Quick & EASY Casserole Dinner Recipes! Julia Pacheco