Heat oil or butter in a large pot over medium heat
Add chopped onion, garlic, and celery
Cook until softened
Add chopped carrots and potatoes
Stir in vegetable broth or water
Add chopped tomatoes, green beans, corn, and any other vegetables
Add salt, black pepper, and dried herbs
Bring to a boil
Reduce heat and simmer until vegetables are tender
Taste and adjust seasoning
Serve hot