Sprinkle the flour over the top, stir well, then pour in the vegetable broth or water.
Add the carrot and parsnip, then season with salt and pepper to taste.
Cook over medium heat for about 15 to 20 minutes, until the vegetables are tender.
Creaming (optional): If you want a creamy soup, you can blend it with an immersion blender, then stir in the sour cream or heavy cream.
Serving: Sprinkle with fresh parsley, and optionally garnish with a few croutons or mushroom slices.