Proceed with boiling or steaming the potatoes using your preferred method. Once cooked, drain them thoroughly and allow them to dry off over low heat. Take a fork or a potato masher and mash the potatoes to your desired consistency. Introduce a piece of butter and season with salt and pepper according to your taste. For added creaminess, incorporate a small amount of hot milk. Continuously beat the mixture over gentle heat until it becomes hot and reaches a delightful fluffy texture. Transfer the mashed potatoes to a preheated serving dish, generously garnishing with finely chopped parsley.