Heat oven to 400°F.
In a large skillet, heat oil over medium heat. Add zucchini, celery, sweet potatoes, onion, salt and pepper and cook about 8 minutes or until soft.
Mix in garlic and stir for another minute.
Combine vegetables, tomatoes, beans, ¼ cup of the bean liquid, thyme and bay leaves in a 2-quart baking dish.
Bake for about 30 minutes or until vegetables are tender.
Remove bay leaves and serve warm.
