Low-Fat Potato and Leek Soup

Ingredients (9)

• + ½ teaspoon unsalted butter add to pantry
• + 1 large white onion, diced add to pantry
• + 2 ribs celery, chopped add to pantry
• + 3 small leeks, cleaned and thinly sliced add to pantry
• ✓ 3 medium potatoes, peeled and chopped
• + 3 cups water, or more as needed add to pantry
• + 3 cups 2% low-fat milk add to pantry
• + ½ teaspoon salt add to pantry
• + ½ teaspoon ground black pepper add to pantry