For the Ratatouille: Heat olive oil in a large pot or Dutch oven over medium heat. Add chopped onion and garlic, sauté for 4-5 minutes until softened and fragrant.
- Stir in diced eggplant, zucchini, and bell peppers. Cook for 8-10 minutes, stirring occasionally, until vegetables soften.
- Add diced tomatoes, white beans, dried thyme, oregano, salt, and pepper. Bring to a simmer, reduce heat to low, cover, and cook for 15-20 minutes until vegetables are tender and flavors meld together.
- For the Polenta: In a medium pot, bring vegetable broth or water to a boil. Gradually whisk in polenta, reduce heat to low, and cook for 20-25 minutes, stirring occasionally, until creamy. Add olive oil, nutritional yeast (if using), and season with salt and pepper.
- To Serve: Spoon a generous amount of creamy polenta onto each plate. Top with ratatouille mixture, ensuring a good portion of vegetables and white beans. Garnish with fresh basil or parsley.