Preheat the oven to 425°F (218°C). Line a large baking sheet with parchment paper.
In a large bowl, combine the 24 oz halved Dutch baby yellow potatoes, 2 tablespoons olive oil, 1/3 cup freshly grated Parmesan (use a micro grater), 1/2 teaspoon each dried oregano, dried basil, paprika, salt, and garlic powder, and 1/4 teaspoon each dried thyme and pepper. Stir or toss until the potatoes are evenly coated.
Arrange the potatoes on the prepared baking sheet cut side down in a single layer, spaced apart so they are not touching.
Bake at 425°F for 25–30 minutes, or until the cut sides are golden and the potatoes are fork-tender (time will depend on potato size).
Remove from the oven, garnish with fresh parsley if desired, and serve warm.