In a large mixing bowl, combine the shredded chicken, Greek yogurt, shredded cheddar cheese, chopped broccoli, garlic powder, onion powder, salt, and black pepper. Mix well.
Transfer the mixture to a baking dish and spread it out evenly.
Bake in the preheated oven for 25-30 minutes, or until the top is golden and bubbly.
Remove from the oven and let it cool for a few minutes before serving.
Notes:
This casserole is perfect for meal prep and can be stored in the fridge for up to 3 days.