Place each potato on a wooden spoon and cut horizontal slits on the potatoes. In a small bowl, combine the butter, olive oil, garlic, salt, cayenne pepper and black pepper together. Stir to combine well. Toss the potatoes with the garlic mixture, coat well. Make sure the garlic mixture gets inside the slits of the potatoes. Transfer the potatoes to a roasting pan.
Roast the potatoes for 15 minutes, then turn them over and baste with the garlic oil. Roast for another 15-20 minutes. Remove from heat, garnish with parsley and serve immediately.
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Notes
You can use regular yellow potatoes or red potatoes to make this recipe. You can also combine both of them together, like my recipe above.