Creating the perfect roast potatoes can be simple if you follow these straightforward steps:

1. Preheat your oven to 425°F (220°C).
2. Prepare the Potatoes: Peel the potatoes and cut them into even-sized chunks, about one to two inches each.
3. Rinse and Dry: Rinse the cut potatoes under cold water to remove excess starch. Pat them dry using a kitchen towel.
4. Parboil: Place the potatoes in a pot of salted water and bring to a boil. Cook for about 5-7 minutes until slightly tender, then drain.
5. Oil the Baking Tray: In a large roasting tray, pour in the olive oil and heat it in the oven for about 5 minutes.
6. Toss the Potatoes: Carefully add the drained potatoes to the hot oil. Toss to coat them evenly.
7. Season: Sprinkle salt, pepper, rosemary, and garlic powder over the potatoes. Toss again to ensure even coating.
8. Roast: Spread the potatoes out in a single layer and roast in the preheated oven for about 30-40 minutes, turning occasionally, until golden brown and crispy.
9. Garnish: Once crispy and cooked through, remove from the oven and garnish with fresh parsley if desired.

Following these steps will guide you in creating incredible roast potatoes effortlessly.