Preheat the oven: Set your oven to 350°F (175°C). Grease a 9x13-inch baking dish with cooking spray or butter.
Make the filling: In a large bowl, whisk together the cream of chicken soup, sour cream, and chicken broth until smooth.
Season and enrich: Stir in garlic powder, onion powder, paprika, salt, and pepper.
Fold in the shredded chicken and cheddar cheese. If using veggies or rice, add them now.
Assemble: Spread the chicken mixture evenly in the prepared baking dish.
Crush the crackers: Place Ritz crackers in a zip-top bag and lightly crush with your hands or a rolling pin. You want coarse crumbs, not powder.
Make the topping: In a small bowl, combine the crushed crackers with the melted butter until evenly coated.
Top the casserole: Sprinkle the buttery cracker crumbs evenly over the chicken mixture, covering the surface.
Bake: Place the dish on the middle rack and bake for 25–30 minutes, until the edges are bubbling and the topping is golden brown.
Rest, then serve: Let the casserole sit for 5–10 minutes to set up a bit.
Scoop and serve warm.