Preheat the oven to 400 degrees. Brush one tablespoon of olive oil evenly on a small baking sheet.
Cut each potato in half lengthwise with a sharp knife, then use the tip of a knife to score the cut sides in a ¼-inch crosshatch pattern. Rub both sides of potato halves with the butter and season with sea salt and freshly cracked pepper, to taste.
Arrange the potato halves, flesh side down, on the prepared baking sheet and bake for 45 minutes, or until tender and crispy.
Meanwhile, make the garlic butter by combining the melted butter, garlic, parsley, and cayenne in a small dish; keep warm.
Carefully flip the potato halves over with a spatula and brush the garlic butter evenly over each potato half.
Return to the oven for 5-7 minutes.
Remove from the oven and serve as is, or topped with sour cream, bacon bits, and green onions or chives. Enjoy.