
Preheat your oven to 350°F (175°C) to prepare for baking the casserole.
In a large bowl, mix the shredded chicken, broccoli florets, cooked rice, Greek yogurt, chicken broth, Dijon mustard, garlic powder, onion powder, salt, and pepper until well combined.
Pour the mixture into a greased 9x13 inch baking dish and spread it evenly.
If desired, sprinkle shredded cheese on top of the casserole.
Bake in the preheated oven for 25-30 minutes, until heated through and bubbly.
Let it cool for a few minutes before serving to enjoy the delicious flavors!