Preheat the oven to 350°F (175°C). Lightly grease a 9-inch baking dish with nonstick cooking spray and set aside.

Prepare the stuffing mix according to the package instructions. Once ready, fluff with a fork and set aside.

Parboil the broccoli by bringing a saucepan of water to a boil. Add the broccoli florets and boil for 3 minutes. Drain immediately and transfer to a large mixing bowl.

Combine the filling. Add the cooked turkey, cream of chicken soup, sour cream, cheddar cheese, salt, and pepper to the bowl with the broccoli. Stir gently until everything is evenly combined.

Transfer to the dish. Spoon the turkey mixture into the prepared baking dish and spread it out evenly.

Top with stuffing. Spoon the prepared stuffing over the casserole in an even layer.

Bake for 30 minutes, or until the top is lightly golden and the casserole is heated through.

Serve warm and enjoy!