1. In the bowl of a multicooker, stir together potatoes, garlic, 1 tablespoon salt, and 1/2 cup water. Secure lid of multicooker. Cook on "Steam" setting for 20 minutes. Once time is complete, let pressure release naturally. Carefully remove lid. Drain potatoes and garlic; let stand 5 minutes, then 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 milk mixture. Adjust seasoning as desired; serve with more butter and chives.