Slice a potato lengthwise to create two halves. Cut each half into 4 slices to create 8 wedges in all. Repeat with remaining potatoes.
Place the potato wedges in a large bowl and cover in cold water. Soak for 30 minutes.
Preheat oven to 400˚F (200˚C). Line a large baking sheet with parchment or grease with oil.
Drain the potato wedges and pat to dry thoroughly.
Dry the large bowl and add the potato wedges.
Drizzle the olive oil over the potato wedges and toss to coat.
In a small bowl, mix together the parmesan, salt, garlic powder, paprika, onion powder, and black pepper. Add to the potatoes and toss again to evenly coat.
Arrange the potato wedges, cut side down, in a single layer on the prepared baking sheet.
Bake in preheated oven, flipping halfway, until the potatoes are fork-tender and golden brown, about 25-30 minutes.
Serve immediately topped with parsley, Parmesan, and black pepper.