Sight-saving Curried Spinach-Potato Soup

Ingredients

• olive oil
  1 tbsp
• chopped leeks

  white and light green parts
  1 cup
• curry powder

  or to taste
  1 tbsp
• vegetable stock
  2½ cups
• white potatoes

  peeled, cut into ½-inch pieces (about 1½ cups)
  2 small
• salt
  1 tsp
• packed cups (about 4 oz) fresh baby spinach leaves
  4 unit
• low-fat (1%) milk
  2 cups
• freshly ground black pepper to taste
  1 unit
• plain nonfat yogurt

  for garnish, optional
  1 unit