Preheat the oven to 175°C. Place the garlic on a piece of foil, drizzle with 1 teaspoon of the oil, wrap and roast until very tender, about 20 minutes.
Meanwhile, put the potatoes in a large saucepan, cover by 1 inch with cold water and bring to a boil. Reduce the heat to a simmer and cook until the potatoes are very tender, about 20 minutes. Strain and return the potatoes to the saucepan.
Add the roasted garlic with any juice that has collected, almond milk, remaining 2 teaspoons of oil and 1 1/4 teaspoons salt to the potatoes. Mash with a potato masher until smooth or to the desired consistency, adding additional almond milk if necessary. Stir in the chives and add salt to taste. Transfer the potatoes to a serving bowl, garnish with additional chives and serve.
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