Preheat your oven to 375°F (190°C).
Bring a pot of salted water to a boil and cook the chickpea pasta for 2 minutes less than the package directions suggest.
Add the finely chopped cauliflower florets to the boiling pasta water for the final 3 minutes of cooking, then drain both.
While the pasta cooks, dice the chicken breast into bite-sized pieces and sauté in a non-stick skillet over medium heat until fully cooked.
In a small saucepan over medium-low heat, whisk together the skim milk, Dijon mustard, garlic powder, onion powder, and nutritional yeast.
Slowly stir the shredded sharp cheddar cheese into the milk mixture until it is completely melted and the sauce is smooth.
Combine the cooked pasta, cauliflower, and chicken in a small oven-safe baking dish.
Pour the cheese sauce over the mixture and toss gently to ensure everything is evenly coated.
Season with sea salt and black pepper to your preference.
Bake for 15 to 20 minutes until the cheese is bubbly and the top begins to turn a golden brown.