Heat olive oil in a large soup pot or Dutch oven over medium heat. When hot, add leeks, onion and carrot, cook covered for 7-8 minutes or until very soft.
2 tablespoons olive oil, 1 large leek, 1 small onion, 1 carrot
Add potato and broth. Cook over medium heat for 15-20 minutes or until potato is fork tender.
1 medium potato, 3 cups vegetable stock
Stir in spinach to wilt. Transfer to blender in batches or use an immersion blender to blend soup.
16 ounces spinach leaves
Return soup to pot and add milk, nutmeg, salt, and pepper. Stir well, taste, and adjust seasoning to taste.
1 cup milk, 1 teaspoon salt, ¼ teaspoon white pepper, ¼ teaspoon nutmeg
Serve soup up in bowls and with a drizzle of Greek yogurt, lemon wedges, or freshly grated nutmeg over the top