01 - Melt the butter in a large pot over medium heat. Add chopped onion, diced celery, and carrot. Sauté for 5 minutes until vegetables begin to soften.
02 - Stir in minced garlic and cook for 1 minute until fragrant, being careful not to burn it.
03 - Add diced potatoes to the pot along with vegetable broth. Bring to a boil, then reduce heat to low, cover, and simmer for 20 minutes until potatoes are completely tender when pierced with a fork.
04 - Remove pot from heat. Puree using an immersion blender until completely smooth, or transfer in batches to a countertop blender and return to the pot.
05 - Stir in heavy cream and chopped chives. Season with salt, pepper, and nutmeg. Heat through over low heat for 3-5 minutes, stirring occasionally. Do not let the soup come to a boil after adding cream.
06 - Ladle hot soup into serving bowls and garnish with additional fresh chives. Serve immediately while hot.