Step 1: Choose and Prepare the Potatoes

1. Pick the Right Potato: Select starchy potatoes like Russet, Yukon Gold, or Maris Piper for the best balance of crispiness and fluffiness. Avoid waxy varieties, which don’t crisp as well.
2. Peel and Cut: Peel the potatoes and cut them into even-sized chunks, about 2 inches in diameter. Uniform sizes ensure even cooking.

Step 2: Parboil the Potatoes

1. Boil Water: Bring a large pot of salted water to a boil.
2. Cook the Potatoes: Add the potatoes to the boiling water and cook for 8-10 minutes, or until the edges are just starting to soften. The parboiling process creates a fluffy exterior that crisps up in the oven.
3. Drain and Dry: Drain the potatoes thoroughly and allow them to steam-dry in the colander for 5 minutes. This step removes excess moisture, essential for achieving crispy results.

Step 3: Preheat the Oven and Prepare the Pan

1. Preheat the Oven: Set your oven to 425°F (220°C).
2. Heat the Oil: Place the olive oil or vegetable oil in a large baking tray and preheat the tray in the oven for 5 minutes. Heating the oil before adding the potatoes ensures immediate crisping.

Step 4: Coat and Season the Potatoes

1. Toss with Oil: Transfer the parboiled potatoes to a large bowl. Toss them gently with the hot oil from the pan, ensuring they are well-coated.
2. Add Seasonings: Sprinkle salt, black pepper, and any desired herbs or spices over the potatoes. Toss again to distribute the seasonings evenly.

Step 5: Roast the Potatoes

1. Spread Evenly: Arrange the potatoes on the preheated baking tray in a single layer. Avoid overcrowding to ensure each piece crisps properly.
2. Roast and Turn: Roast for 25-30 minutes, then flip the potatoes using tongs or a spatula to promote even browning. Roast for an additional 20-30 minutes, or until golden and crispy.

Step 6: Garnish and Serve

1. Add Fresh Herbs: For a burst of freshness, sprinkle chopped parsley or cilantro over the potatoes before serving.
2. Serve Immediately: Crispy roast potatoes are best enjoyed fresh out of the oven. Pair them with your favorite main course or enjoy them on their own with a dipping sauce.