Add potato chunks and 1 teaspoon of sea salt to a large pot with enough water to cover the potatoes. Bring to a boil, then reduce the heat to low and simmer the potatoes until they’re tender.
Heat half of the butter in the pot over medium heat until it’s melted. Add the torn kale leaves and ¼ teaspoon of sea salt. Completely wilt the kale so it’ll stir into the potatoes easily.
Add the green onions to the pot, stir to combine and cook for about a minute. Then add the potatoes back into the pot with half of the milk and the other half of the butter