Combine stock, coconut milk, and nutritional yeast; bring to a boil. Meanwhile, add rice, chickpeas, onion, garlic, celery, and mushrooms to the casserole dish, spreading evenly.
Pour boiling liquid over the casserole, cover with parchment and foil, then bake for 45 minutes.
Let sit for 5 minutes, uncover, top with parsley, and serve warm.
Notes
This dish is perfect for a cozy, nutritious vegan meal that can be prepared ahead and enjoyed throughout the week.