Cook and shred the chicken if needed. Cook the rice.
In a large bowl, mix rice, shredded chicken, sour cream, cheddar cheese, chicken broth, garlic powder, salt, pepper, paprika, and frozen peas.
Transfer the mixture to a greased 9x13-inch baking dish.
Cover with foil and refrigerate until ready to bake.
Preheat oven to 375°F (190°C).
If using a topping, mix crushed crackers with melted butter and sprinkle over the casserole.
Bake uncovered for 25-30 minutes until heated through and bubbly.
Let rest for 5 minutes before serving. Enjoy!