Preheat your oven to 375°F (190°C) and lightly grease a baking dish.
In a large mixing bowl, add the shredded chicken, cottage cheese, spinach, mushrooms, cooked rice, garlic powder, onion powder, salt, black pepper, and Italian seasoning. Mix everything until well combined.
Transfer the mixture into the prepared baking dish. Pour the chicken broth evenly over the top, then sprinkle with shredded mozzarella cheese.
Bake for 25–30 minutes, until the casserole is hot and bubbly with a golden, melty cheese topping.
