This poppy seed chicken casserole is a creamy, comforting Southern classic made with tender shredded chicken, a rich velvety sauce, and a buttery cracker topping baked until golden and crisp.
Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish.
In a large bowl, mix sour cream, cream of chicken soup, garlic powder, onion powder, salt, pepper, and lemon juice.
Add shredded chicken and poppy seeds, folding gently until well combined.
Transfer mixture to prepared baking dish and spread evenly.
Crush Ritz crackers and mix with melted butter until coated.
Sprinkle cracker mixture evenly over the casserole.
Bake uncovered for 25–30 minutes until bubbly and golden brown.
Let rest for 5 minutes before serving.
Notes
Use rotisserie chicken for convenience and added flavor. Let casserole rest 5 minutes before serving. For extra crunch, broil for 1–2 minutes at the end. Store leftovers in the refrigerator for up to 3 days or freeze up to 3 months.