Preheat your oven to 400°F and line a baking sheet with parchment paper.
Slice the red bell pepper, zucchini, and red onion into bite-sized pieces.
Toss the vegetables on the baking sheet with olive oil, sea salt, and black pepper.
Roast the vegetables for 20 minutes until they are tender and slightly charred.
While vegetables roast, cook the chickpea pasta in boiling salted water according to package directions.
Reserve 0.5 cup of the starchy pasta water before draining the noodles.
In a small bowl, whisk together the Greek yogurt, parmesan cheese, nutritional yeast, Cajun seasoning, and garlic powder.
Return the drained pasta to the pot over very low heat and stir in the yogurt sauce mixture.
Gradually add the reserved pasta water one tablespoon at a time until the sauce is smooth and creamy.
Gently fold the roasted vegetables into the pasta and serve immediately.