Preheat your oven to 400°F (200°C).

Wash the potatoes thoroughly to remove any dirt. You can peel them if you prefer, but keeping the skin adds texture and flavor. Cut the potatoes into evenly sized cubes, about 1 inch each, for uniform cooking.

In a large mixing bowl, combine the cubed potatoes, olive oil, garlic powder, onion powder, paprika, dried rosemary, salt, and pepper. Toss everything together until the potatoes are well-coated.

Spread the seasoned potatoes in a single layer on a baking sheet.

Place the baking sheet in your preheated oven and roast for 30 to 40 minutes until golden brown, crispy on the outside, and tender on the inside, flipping the potatoes halfway through for even roasting.

Once done, remove from the oven. Garnish with fresh parsley if desired, and serve hot alongside your favorite main dish.