Low-Fat Potato and Leek Soup

Ingredients (9)

• ✓ ½ teaspoon unsalted butter
• + 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 add to pantry
• + 3 cups water, or more as needed add to pantry
• + 3 cups 2% low-fat milk add to pantry
• ✓ ½ teaspoon salt
• ✓ ½ teaspoon ground black pepper