01 - Heat 1 tablespoon olive oil in a large pot over medium heat. Add the turkey bacon and cook until crisp, about 5–7 minutes, turning occasionally. Remove bacon, drain on paper towels, and crumble once cool. Set aside for garnish.
02 - In the same pot, add the remaining 1 tablespoon olive oil. Sauté leeks and onion with a pinch of salt over medium heat until softened, about 5–6 minutes. Add garlic and cook for 1 minute until fragrant.
03 - Stir in the potatoes, thyme, nutmeg, salt, and pepper. Cook for 2 minutes to blend flavors, then pour in the broth. Bring to a boil, reduce heat to a simmer, cover, and cook until potatoes are very tender, 18–20 minutes.
04 - Remove the pot from heat. Use an immersion blender to puree the soup until smooth, or leave slightly chunky if desired. Alternatively, blend in batches using a countertop blender and return to the pot.
05 - Stir in the milk or half-and-half. Warm the soup gently over low heat, but do not allow it to boil. Adjust seasoning with salt and pepper to taste.
06 - Ladle the hot soup into serving bowls. Top generously with the crispy turkey bacon crumbles and a sprinkle of fresh chives or parsley.