- Preheat oven to 375ºF. Place garlic cloves in the center of a piece of aluminum foil. Drizzle with olive oil. Wrap tightly and place on a baking sheet. Transfer to oven. Roast for 30-35 minutes. Cloves are ready when they are a rich brown color and soft. Cool at room temperature while preparing potatoes.
- Lightly peel and quarter potatoes. Add to a large pot and cover with water. Salt water and bring to a boil over medium heat. Boil for 15-17 minutes, until potatoes are fork tender.
- Drain potatoes and return to pot. Add butter, sesame oil, milk, roasted garlic cloves, and salt. Use a hand mixer or potato masher to blend garlic into potatoes until potatoes are mostly smooth, careful not to over mix.
- Transfer to a serving bowl and drizzle with extra sesame oil if desired. Top with green onion and toasted sesame seeds.