Heat the butter and 1 tablespoon olive oil in a soup pot over medium heat. Add the onion, garlic, and thyme and cook until the vegetables are good and soft, 8 to 10 minutes. Dust the vegetables with flour and stir to coat everything well. Pour in the vegetable stock and bring to a boil. Add the cream and the potatoes, bring to a boil and boil hard for about 7 minutes, until the potatoes break down (this will help to thicken the soup and give it a good texture).
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