1. In the bowl of a multicooker, stir together potatoes, garlic, 1 tablespoon salt, and 1/2 cup water. Secure lid of multicooker. Choose "Steam" setting and set timer for 20 minutes. Once cycle is complete, allow pressure valve to release slowly. Carefully remove lid. Drain potatoes and garlic and let stand 5 minutes; return to multicooker.

2. Heat milk and butter in a small saucepan over medium until butter is melted and mixture is warm to the touch. Meanwhile, mash potatoes with a potato masher until mostly smooth. Stir in warm milk mixture to combine. Adjust seasoning as desired and serve with more butter and chives.