Preheat your oven to 375°F (190°C) and lightly grease a small baking dish with a drizzle of olive oil.
Cut the chicken breast into bite-sized 1-inch cubes and chop the broccoli, bell pepper, and zucchini into uniform pieces.
In a large mixing bowl, whisk together the Greek yogurt, olive oil, garlic powder, onion powder, sea salt, and black pepper until smooth.
Add the cubed chicken and chopped vegetables to the bowl, tossing thoroughly until every piece is evenly coated in the yogurt mixture.
Transfer the mixture into the prepared baking dish, spreading it out into an even layer.
Sprinkle the nutritional yeast over the top to provide a savory, cheese-like finish.
Bake for 25 to 30 minutes, or until the chicken is fully cooked through and the vegetables are tender-crisp.
Remove from the oven and let rest for 5 minutes before serving to allow the juices to settle.