01 - Heat 1 tablespoon olive oil in a large pot over medium heat. Add turkey bacon and cook, turning occasionally, until crisp, about 5 to 7 minutes. Remove, drain on paper towels, crumble when cool, and set aside.
02 - Add remaining 1 tablespoon olive oil to the pot. Sauté leeks and onion with a pinch of salt over medium heat until softened, approximately 5 to 6 minutes. Add garlic and cook for an additional 1 minute until fragrant.
03 - Stir in potatoes, dried thyme, nutmeg if using, kosher salt, and black pepper. Cook for 2 minutes, then pour in the broth. Bring to a boil, reduce heat to a simmer, cover, and cook until potatoes are tender, about 18 to 20 minutes.
04 - Remove pot from heat. Puree soup using an immersion blender until smooth, or blend in batches using a countertop blender. Return to pot.
05 - Stir in milk or half-and-half and gently warm over low heat without boiling. Adjust seasoning as needed.
06 - Ladle soup into bowls. Garnish with crumbled turkey bacon and finely chopped chives or parsley.