Preheat the oven to 400ºF and line a baking sheet with parchment paper.
Add the potatoes to a bowl and toss them will olive oil to coat. Set aside.
In a separate bowl, add the parmesan cheese, salt, thyme, rosemary, and black pepper. Mix to combine.
Pour the cheese mixture on top of the lined baking sheet. Place each potato, cut side down onto the cheese. Be sure to firmly press the potato into the cheese. Repeat until all the potatoes are used.
Bake for 40 minutes. Remove from the oven when the potatoes are fork-tender.
Let the potatoes rest for 5 minutes.
Use a metal spatula to cut between every few potatoes to prepare to flip the potatoes over. Scoop under the parmesan cheese and flip the potatoes onto a serving platter, cheese side up.
Serve with ketchup or your favorite dipping sauce.