Chop potatoes into equally sized ½ inch -1 inch pieces. Toss in 2 tablespoon olive oil, salt, pepper, and crushed red pepper.
Drizzle 2-3 tablespoon of olive oil over the baking sheet. Place it in the oven and preheat the oven to 400℉. Once preheated, pull the pan out and place it on the stove. Carefully pour the potatoes onto the pan in an even layer. Place the four garlic cloves throughout the pan, still in their husk.
Roast potatoes for 28-35 minutes. Flip them over at 15 minutes.
Remove the pan from the oven. Pour 2 tablespoon olive oil into a bowl. Take the garlic still in the husk and squeeze out the garlic from within. It should be like a paste. Add the parsley to the olive oil and mash together using a fork. Use a food processor only if necessary.
Add the potatoes to a bowl and drizzle with olive oil mixture. Top with parmesan and toss all together. Serve immediately.
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Notes
Preheating the pan in the oven with the layer of olive oil is what gives you the crispiest roasted potatoes. It allows you to essentially fry the potatoes while also roasting them. Be careful when you place the potatoes because it will splatter
I like to add the parmesan after roasting the potatoes because the potatoes get really crispy, the cheese isn't burnt, and it keeps its nutty flavor.