Preheat the oven to 400℉ and line a baking sheet with parchment paper.
Wash and dry the baby potatoes, then add them to a medium bowl. Drizzle with olive oil, add the seasonings and a dash of salt and pepper. Toss well to coat.
Transfer the potatoes to the prepared baking sheet and spread them out in an even layer. Bake for 30 minutes, until tender.
Remove from the oven and gently smash each potato using the bottom of a glass or jar.
Sprinkle the parmesan cheese over the smashed potatoes, then return to the oven and bake for another 5–10 minutes, until the cheese is melted and the edges are golden and crispy.
Let cool slightly before serving. If you are using parsley, sprinkle the finely diced parsley over the potatoes before serving.