Step 1: Prepare the Leeks : Slice leeks lengthwise and rinse thoroughly to remove dirt. Drain well.

Step 2: Sauté Aromatics : In a large pot, melt butter over medium heat. Add leeks and sauté for 8–10 minutes until soft and translucent. Add garlic and cook for another 1 minute until fragrant.

Step 3: Add Potatoes and Broth : Stir in diced potatoes, salt, and pepper. Pour in broth and bring to a gentle boil.

Step 4: Simmer : Reduce heat and simmer uncovered for 20–25 minutes, or until potatoes are very tender.

Step 5: Blend the Soup : Use an immersion blender to purée the soup until smooth. Alternatively, blend in batches using a countertop blender.

Step 6: Add Creaminess : Stir in milk or cream and nutmeg (if using). Simmer gently for 5 minutes, adjusting seasoning as needed.