Steam potatoes in a stovetop steamer until tender, about 15-20 minutes. Alternatively place them in a pot with a lid and add 2 or 3 inches of water to the bottom. Steaming cooks faster and leaves more nutrients and flavour in the potato than boiling.
Place potatoes into a large bowl and add cheese, olive oil and salt and pepper. Mash away, adding more oil if you prefer a thinner consistency. Stir in the parsley just before serving.
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