In a large pot, bring the chicken broth to a boil. Add the orzo pasta and cook according to package instructions until al dente, about 8-10 minutes.
While the orzo is cooking, steam the broccoli florets until tender, about 5 minutes. Set aside.
Once the orzo is cooked, drain any excess liquid and return it to the pot.
Stir in the olive oil, shredded chicken, steamed broccoli, garlic powder, onion powder, milk, and half of the cheddar cheese. Mix well until everything is combined and heated through.
Season with salt and pepper to taste.
Transfer the mixture to a serving dish and top with the remaining cheddar cheese.
Place under the broiler for 2-3 minutes until the cheese is bubbly and golden.