In a large soup pot, add the celery and onion with a drizzle of olive oil. Cook for 5 minutes until slightly softened, then add the stock.
Let the stock heat through, then add ⅔ EACH of the chopped potato and the cheese. Add all of the cream and the sour cream. Stir to combine.
Using a blender or immersion blender, carefully puree the soup until smooth. Return to the pot, and add the remaining chopped potatoes and most of the scallions. Stir, and let simmer for 5 minutes. Taste, and add salt and pepper as needed.
Garnish with the remaining cheese and scallions, and serve!
Notes
I bake my potatoes in the microwave for about 25 minutes, but use any cooking method you like! I also love this crock pot baked potato method.This soup is vegetarian as written, but feel free to add cooked crumbled bacon to the soup or as a topping!