Preheat oven to 450°F. Boil broccoli for 3-5 minutes until tender-crisp, then drain.
In a large bowl, combine cooked chicken, cream of chicken soup, sour cream, 1 cup cheddar cheese, milk, salt, and pepper. Mix until well combined. Gently fold in broccoli.
Transfer mixture to a 9x13-inch casserole dish. Sprinkle remaining cheddar cheese on top.
In a small bowl, mix breadcrumbs with melted butter. Sprinkle evenly over the casserole.
Bake for 20 minutes until cheese is melted and topping is golden.
Remove from oven and let cool for a few minutes before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for 3–5 days. Reheat in the oven or microwave.