Creamy poppyseed chicken casserole tops tender chicken in a rich cream sauce with buttery Ritz cracker crumbs. This protein-packed, family-friendly chicken dish is a Southern potluck legend.
Preheat the oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish.
In a large bowl, combine the sour cream, cream of chicken soup, kosher salt, black pepper, onion powder, and garlic powder, stirring until smooth.
Fold the cooked chicken and poppy seeds into the cream mixture, ensuring all pieces are well coated.
Spread the chicken mixture evenly into the prepared baking dish and set aside.
In a separate bowl, mix the crushed Ritz crackers with melted butter, then sprinkle this crumb mixture evenly over the casserole.
Bake in the preheated oven for 30–35 minutes, until the top is golden and the casserole is bubbling around the edges.
Allow to rest 5–10 minutes before serving to help set the creamy filling.