Preheat oven to 400˚F and line a large baking sheet with aluminum foil or parchment. Grease well with oil.
Slice each potato lengthwise into 8ths. Place in a large bowl and drizzle with the olive oil. Toss to evenly coat.
In a small bowl, mix together the parmesan, garlic powder, onion powder, and seasoned salt. Add to the potatoes and toss again to evenly coat.
Arrange the potato wedges, one side down, in a single layer on prepared baking sheet.
Bake in preheated oven until the potatoes are fork-tender and golden brown, 25-30 minutes.
Serve immediately topped with parsley and parmesan.