Preheat the oven to 400°F and spray a 9x13-inch baking pan or cast iron skillet with cooking spray, then add 1 teaspoon vegetable oil to coat the bottom.
In a small bowl, mix together Parmesan cheese, salt, garlic powder, paprika, thyme, and black pepper.
Pat the cut side of each potato half dry with paper towels.
Place the potatoes in a medium bowl and drizzle with 1 tablespoon vegetable oil, then toss until lightly coated.
Sprinkle the Parmesan mixture over the potatoes and toss to coat evenly.
Arrange the potatoes cut side down on the prepared baking pan.
Bake for 15 to 20 minutes.
Flip the potatoes over and bake for another 15 to 20 minutes until golden and crispy.
Notes
Tips and Tricks
Dry the Potatoes Well - Pat the cut sides of the potatoes dry with paper towels before adding oil. This helps them get extra crispy in the oven.Cut Evenly - Try to cut the potatoes into similar sizes so they cook at the same rate. Smaller pieces will cook faster than larger ones.Don't Overcrowd the Pan - Arrange the potatoes in a single layer with space between them. Crowding the pan creates steam, which makes them soft instead of crispy.Use Parchment Paper - Line your baking pan with parchment paper for easier cleanup. The potatoes still crisp up nicely.Check for Doneness - The potatoes should be golden brown and tender when pierced with a fork. If they need more time, bake for another 5 minutes.
Storing and Reheating
Refrigerator - Store leftover potatoes in an airtight container in the refrigerator for up to 4 days.Reheat in Oven - Place potatoes on a baking sheet and reheat at 375°F for 10 to 15 minutes until warmed through and crispy again.Reheat in Air Fryer - Air fry at 375°F for 5 to 7 minutes for the crispiest results.