Preheat the oven to 400°F.
Add the cubed potatoes to a large pot and cover with cool water. Add 1½ teaspoons salt.
Bring to a boil over high heat. Reduce to medium-high and simmer uncovered for 4–6 minutes, until just firm when pierced with a fork. Drain.
Spread the olive oil on a large baking sheet. Scatter the drained potatoes on the pan and sprinkle with the remaining 1 teaspoon salt, onion powder, garlic powder, and smoked paprika. Toss until evenly coated.
Roast for 25–28 minutes, stirring every 7–8 minutes, until deep golden brown and crispy. Serve hot.
