Preheat your oven to 425°F (220°C). Place a large baking sheet in the oven to preheat as well.
In a large pot, add the peeled and cubed potatoes. Cover them with cold water and add a pinch of salt. Bring the water to a boil and let the potatoes simmer for about 5-7 minutes, or until they are slightly tender when pierced with a fork. Drain the potatoes and let them sit for a few minutes to steam dry.
In a bowl, combine the potatoes, olive oil, dried rosemary, salt, and black pepper. Mix well.
Remove the preheated baking sheet from the oven and carefully drizzle it with olive oil to coat the pan. Tilt the sheet to ensure even coverage.
Spread the parboiled potato mixture evenly on the hot baking sheet, ensuring they are in a single layer.
Roast the potatoes in the preheated oven for about 30-35 minutes, or until they are golden brown and crispy on the outside, flipping them halfway through to ensure even cooking.
Once the potatoes are crispy and golden, remove them from the oven, and let them rest for a couple of minutes before serving.
Serve your Crispy Oven Roasted Potatoes hot and enjoy!