Bring a pot of salted water to a boil and cook the chickpea pasta according to the package directions until al dente.
While the pasta cooks, steam the broccoli florets until they are bright green and just tender.
Season the chicken breast with half of the salt and pepper, then sauté in olive oil over medium heat until cooked through and golden.
In a high-speed blender, combine the soaked cashews, nutritional yeast, onion powder, lemon juice, water, and remaining salt and pepper.
Blend the sauce ingredients until completely smooth and creamy, adding a splash more water if needed to reach your desired consistency.
Drain the pasta and return it to the pot, then stir in the sliced chicken, steamed broccoli, and the creamy cashew sauce.
Toss everything together over low heat for one minute to allow the flavors to meld before serving.