Preheat the oven to 415°F. Spray a large baking sheet with non-stick oil and set aside.
Place the potatoes, olive oil, garlic, salt and pepper in a large bowl and toss until well coated.
Spread out evenly onto a large baking sheet. Roast in the oven for 30-40 minutes, or until fork tender and the edges are golden brown. Toss half way through.
Sprinkle parmesan cheese on top the last 5 minute of baking if desired. Salt and pepper, to taste.