Preheat oven to 425ºF. Line 2 large sheet pans with parchment paper (not aluminum foil, see note below).
Scrub potatoes: Wash and scrub the potatoes until clean using a brush. Since we'll be roasting them with the skin on, it's important that they are clean.
Cut into wedges: Cut each Russet potato into about 8 even-sized wedges. I usually cut each on in half lengthwise first, and then cut each half into 4 wedges. Pat dry the potatoes thoroughly.
Season: In a large bowl, toss the potatoes with the olive oil, thyme, paprika, garlic powder, onion powder, salt, and pepper until evenly coated.
Arrange: Transfer to the lined sheet pans and lay every edge flat. Space them about 1-2 inches apart. Don’t overcrowd so that they roast properly and not steam.
Bake for about 35 minutes total, flipping them after about 25 minutes into the baking time. Once ready, they should be golden brown and crispy. Tip: Take a quick peak underneath to see if they golden enough for flipping. Let them roast on each side undisturbed so they develop that crust.
Finish: Remove from the oven and immediately toss with grated parmesan cheese and chopped parsley. Serve warm. Enjoy!