Step 1: Preheat the oven to 425°F (220°C) for crispy potatoes.
Step 2: Wash and scrub the russet potatoes. Slice them into even rounds, about 1/4 inch thick.
Step 3: In a mixing bowl, combine sliced potatoes with olive oil, salt, black pepper, garlic powder, onion powder, and dried rosemary. Toss gently until evenly coated.
Step 4: Spread the seasoned potato slices in a single layer on a baking sheet, ensuring they aren't overlapping.
Step 5: Bake for about 25-30 minutes, flipping halfway through for even browning.
Step 6: Check for doneness after 25 minutes; they should be golden brown and crispy. Bake longer if needed.
Step 7: Remove from oven, let cool for a minute, and garnish with fresh chopped parsley before serving.