Mashed Potato Leek Soup
A creamy blended leek and vegetable soup that turns leftover mashed potatoes into a cozy bowl with milk, pepper and optional fresh herbs.
Prep 10 min · Cook 30 min · Total 40 min · Makes 6 servings

Ingredients
- 2 cups mashed potatoes
- 3 cups clean, chopped leeks
- 1 medium stalk celery, chopped
- 1 large carrot, chopped
- 4 cups water
- 1 1/2 teaspoon salt
- 1 cup milk, as needed
- Fresh ground pepper
Directions
- In a soup pot or Dutch oven, combine the leeks, celery, carrot, water and salt, then bring everything to a boil and cook until the vegetables are tender.
- Warm the leftover mashed potatoes in the soup pot.
- Transfer the cooked vegetables to a blender or food processor and puree them until smooth, working in batches if needed.
- Pour the puree back into the pot with the potatoes and stir until the soup comes together, adding milk as needed to reach the thickness you want.
- Season with black pepper to taste, then taste again and adjust the salt if it needs it.
- Serve the soup hot or cold.
- If you like, finish it with fresh herbs such as basil, thyme or rosemary.