In a large pot over medium-high heat, sauté the onions and garlic in olive oil. Cook until translucent and fragrant. Stir in the broth and the next 7 ingredients (through bay leaves). Simmer for 20 minutes.
Add the rotini, cooking for about 8-10 minutes, or until the pasta is al dente. Stir in nutritional yeast and lemon zest just before serving.