For a creamier texture without dairy, you can blend half of the soup before adding the spinach, or stir in a splash of heavy cream or half-and-half at the end.
Use Yukon Gold or Russet potatoes for the best results; Yukon Golds will yield a slightly richer, creamier soup due to their higher fat content.
Ensure leeks are thoroughly washed to remove any sand or dirt trapped between the layers.
This soup is best served fresh, but leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stove.
For added protein, consider adding cooked white beans or shredded chicken.