Peel and dice potatoes into very small, even cubes
Rinse diced potatoes under cold water until water runs mostly clear
Parboil potatoes in salted boiling water for 4–5 minutes until just tender
Drain and spread potatoes out to steam dry for about 5 minutes
Transfer potatoes to a bowl and toss with cornstarch, salt, onion powder, garlic powder, paprika, pepper, and optional sugar or cayenne
Drizzle oil or melted butter over potatoes and toss gently to coat
Cook using preferred method until golden and crispy
Serve hot