Brush one tablespoon of olive oil evenly on a small baking sheet.
Cut each potato in half lengthwise, then use the tip of a knife to score cut sides in a ¼-inch crosshatch pattern.
Toss potatoes in remaining olive oil and season with sea salt and freshly cracked pepper, to taste.
Arrange flesh side-down on prepared baking sheet and bake for 25-30 minutes, or until tender.
Meanwhile, make the garlic butter by combining the melted butter, garlic, parsley, and cayenne together in a small dish; keep warm.
Carefully flip the sweet potatoes over with a spatula and brush the garlic butter evenly over the sweet potatoes. Return to the oven for another 3-5 minutes.
Remove from the oven and sprinkle a bit of sea salt on top of each potato half, if desired. Serve and enjoy.