Place a baking sheet in the oven then preheat the oven to 400°F.
Add the potatoes to a large bowl. Drizzle in the olive oil then add the garlic powder (optional), salt and pepper. Toss until well-coated.
Carefully remove the baking sheet from the oven. Add the potatoes to the hot baking sheet, spreading them into a single layer.
Return the baking sheet to the oven and roast the potatoes until golden brown and crispy, 50 to 60 minutes, flipping the potatoes every 20 minutes.
Remove the potatoes from the oven and serve.
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