1. Preheat oven to 350 degrees Fahrenheit. Line a sheet pan with Gefen Parchment Paper.
2. Spread potatoes on prepared sheet pan.
3. Drizzle olive oil over the potatoes evenly. Sprinkle kosher salt, black pepper, and rosemary over the potatoes.
4. Toss to coat evenly.
5. Roast the potatoes at 350 degrees for 30 minutes, then turn up the heat to 425 and roast for 15 more minutes.