- Preheat the oven to 350°F (175°C).
- In a large pot, cook the gluten-free pasta according to package instructions; drain and set aside.
- In a large mixing bowl, combine the shredded chicken, broccoli florets, cooked pasta, cheddar cheese, chicken broth, milk, garlic powder, onion powder, salt, and pepper.
- Transfer the mixture to a greased baking dish and spread evenly.
- If using, sprinkle gluten-free breadcrumbs on top for added crunch.
- Bake in the preheated oven for 25-30 minutes, or until the casserole is bubbly and the top is golden brown.
- Let it cool for a few minutes before serving.
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