Preheat Oven: Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper for easy cleanup.
Slice Potatoes: Slice the sweet potatoes into uniform 1/4-inch thick rounds.
Season: In a large bowl, combine the sweet potato rounds, olive oil, dried rosemary, dried thyme, salt, and pepper. Toss well until all the rounds are evenly coated.
Arrange and Roast: Spread the seasoned sweet potato rounds in a single layer on the prepared baking sheet. Do not let them overlap.
Bake: Roast for 20-25 minutes, flipping them halfway through, until they are tender and beautifully caramelized at the edges.
Garnish and Serve: Immediately transfer the hot roasted rounds to a serving platter. Sprinkle generously with the crumbled feta cheese and fresh chopped parsley. Serve warm.