Grease a 13 x 9 casserole dish. Preheat the oven to 350.
Add the rice, turkey, broccoli, onions, celery, carrots, and garlic to the casserole dish. Toss to combine.
In a small pot, combine the broth, milk, cornstarch, mustard powder, parsley, and pepper. Bring to a boil. Lower the flame and let the sauce simmer until it thickens.
Pour the sauce over the casserole and stir until thoroughly combined.
Sprinkle the cheese over the the top of the casserole.
Bake at 350 degrees for 30 minutes or until the liquid has been cooked off.
Let it set for 5 minutes before serving.
Recipe by Premeditated Leftovers™ at https://premeditatedleftovers.com/?p=489