Preheat the oven to 350ºF (177ºC) and lightly grease a 9X13” baking dish (23 X 33 cm), or a medium baking dish (for a deep dish casserole). Set aside.
Add the gluten-free cream of chicken soup, sour cream, shredded cheese, 1 teaspoon of poppy seeds, garlic powder, onion powder, and black pepper to a large bowl. Stir until well combined.
Add the chicken to the soup and cheese mixture, and fold it together until the chicken is well distributed.
Transfer into the prepared baking dish, and spread into an even layer.
Add the butter to a microwave-safe bowl and melt the butter in the microwave. Stir in the poppy seeds.
Crush the gluten-free crackers either in a food processor, or by adding them to a ziploc bag and smashing them with a rolling pin.
Pour the crushed crackers into the melted butter and poppy seed mixture and stir until well coated.
Sprinkle the buttered cracker mixture on top of the base layer, and spread it into a thin, even layer.
Bake in the preheated oven for 20-25 minutes or until bubbly with a golden brown topping (for deep dish you may need to bake for an additional 5-10 minutes).
Switch the oven to “broil”. Broil for 1-3 minutes, or until the top is golden and crisp - watch it closely, as food can burn quickly under this setting. Note: Only broil the cracker topping if your baking dish is broiler-safe. If not, bake at an increased temperature of 450ºF (232ºC) for 5 minutes, or until the topping is crisp.
Allow to cool for 5-10 minutes, then serve and enjoy.
Notes
*This recipe is the perfect way to use up leftover chicken. This could be from a store-bought rotisserie chicken, a roast chicken, or cubed leftover chicken breasts. If you don't have any prepped, you could prepare shredded chicken in a Dutch oven or covered baking dish. **If you can't find a gluten-free condensed soup, try making homemade cream of chicken soup using a gluten-free one-to-one flour mix. ***Panko topping: If you prefer, you can substitute the crushed crackers for panko breadcrumbs instead. Reduce the butter to ¼ cup, and add about ½ cup of breadcrumbs. Keep adding more until you get the desired consistency (they should be well coated; not dry, and not soggy).Gluten-free brands used: We use Pacific Foods cream of chicken soup, and Schar entertainment crackers for the crispy topping. You can use whatever brands you like best! With rice: Use 2 cups of chicken instead of 3 cups, and add 1-2 cups of pre-cooked rice in its place.