Preheat the oven to 200°C / 400°F.
Peel the potatoes using a potato peeler or knife, if desired.
If leaving the skin on, wash the potatoes thoroughly to remove any dirt.
Rinse the potatoes under clean water.
Pat the potatoes dry thoroughly with paper towels.
Cut the potatoes into even slices to ensure uniform baking.
Place the sliced potatoes in a large mixing bowl.
Add the dried parsley, dried rosemary, garlic powder, onion granules, black pepper, and salt.
Add the vegetable oil, sunflower oil, or olive oil.
Toss the potatoes until all slices are evenly coated with the oil and seasoning mixture.
Line a baking tray with foil or parchment paper.
Arrange the seasoned potato slices on the prepared baking tray in a single layer.
Avoid overlapping or piling the potato slices to allow even baking and crisping.
Place the baking tray in the preheated oven.
Bake for 25 to 30 minutes, or until the potatoes are tender inside and crispy on the outside.
Check the potatoes for doneness by inserting a fork into the center of a slice.
Remove the baking tray from the oven once the potatoes are fully cooked, fluffy inside, and crisp around the edges.
Transfer the sliced baked potatoes to a serving plate.
Serve warm as a side dish with preferred main dishes or dipping sauces.