- Fill a large pot with cold water, add salt, and bring to a boil. Add potatoes and cook 15–18 minutes until fork-tender. Drain and let steam dry 2 minutes. 
- Warm cream with minced garlic on low heat for 3–4 minutes. 
- Return drained potatoes to pot over low heat, add butter, and mash until smooth. 
- Add warm cream gradually while mashing to reach a creamy texture. 
- Remove from heat, drizzle in truffle oil, fold gently, and season with salt, pepper, and Parmesan. 
- Transfer to serving bowl, drizzle more truffle oil, and garnish with chives and shaved Parmesan.