Peel and cut potatoes. Cut the ends of each garlic clove, then crush with the side of a knife and remove the peel.
Add the potatoes and crushed garlic cloves to a pot and cover with water, about 10 cm above the potatoes. Add 1 teaspoon of sea salt, then place on the stove over a high heat and bring to the boil.
Once boiling, turn down to medium heat then cook until the potatoes are fork-tender.
Once cook, drain the potatoes and garlic. Add the butter to the pot, then place the potatoes and garlic back in and mash with a masher.
Add half the cream, then mix with a hand mixer on low or whisk until cream is incorporated.
Place the pot over low heat, add cracked black pepper and rest of the cream and mix with the hand mixer on high or a whisk until smooth.
Add the chives and mix through with a spoon. Then add 1 teaspoon of sea salt or to taste and continue stirring until the mashed potatoes are warmed through.