Cut the potatoes into small pieces and boil until soft. Melt the butter. Once the potatoes are cooked, mash them and season with salt to taste.

Heat the milk and gradually add it to the potatoes, then add the butter. Reserve 1-2 teaspoons of unsalted butter to top later. Mix the potatoes, butter, and milk until smooth and creamy, then transfer to a bowl. Top with a little cilantro and drizzle the remaining butter over the top.