Preheat the oven to 375 degrees. Place the diced potatoes In a large mixing bowl and add the olive oil, garlic salt, onion powder, and black pepper. Toss to coat well.
Add the breadcrumbs and toss to coat the potatoes. Spread the potatoes out onto a large rimmed cookie sheet.
Using a microplane zester, grate the parmesan cheese over top of the potatoes (if using).
Bake for 35 minutes, stirring once, until potatoes are browned, crisp, and cooked through.