Chicken Divan casserole is the epitome of American comfort food, blending tender chicken, nutritious broccoli, and a creamy, cheesy sauce into a hearty dish perfect for weeknight dinners or make-ahead meals.
Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish.
Steam broccoli florets until bright green and tender-crisp, about 3-4 minutes. Drain thoroughly.
In a large bowl, whisk together soup, mayonnaise, sour cream, lemon juice, garlic powder, salt, and pepper until smooth.
Spread rice evenly in the baking dish. Layer with chicken and broccoli. Pour sauce mixture evenly over the top.
Top with 3/4 of the cheddar cheese and all the Parmesan cheese. Cover with foil and bake for 25 minutes.
Mix panko with melted butter. Remove foil, top casserole with remaining cheddar cheese and breadcrumbs. Bake uncovered for 10–15 more minutes until golden and bubbly. Let rest for 5 minutes before serving.
Notes
To avoid a watery casserole, drain broccoli thoroughly. Use rotisserie chicken for convenience. For variation, swap broccoli with cauliflower or try a lighter version using Greek yogurt.