Preheat your oven to 400°F (200°C).

Wash and peel the potatoes, then cut them into 1-inch cubes or wedges.

In a large bowl, toss the cut potatoes with olive oil, salt, and black pepper until evenly coated.

Spread the seasoned potatoes in a single layer on a baking sheet.

Roast for 25-30 minutes, or until the potatoes are tender and lightly browned, flipping halfway through.

Remove the baking sheet from the oven and sprinkle the shredded Manchego cheese over the hot potatoes.

Return to the oven for 3-5 minutes, or until the cheese is melted and bubbly.

Garnish with fresh chopped parsley, if desired, and serve immediately.