01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large bowl, toss sweet potato rounds with olive oil and salt until evenly coated.
03 - Arrange sweet potatoes in a single layer on the prepared baking sheet, ensuring they do not overlap.
04 - Roast for 15 minutes, then flip each round and continue roasting for another 12–15 minutes, or until golden and crisp at the edges.
05 - While the sweet potatoes roast, mix granulated sugar and cinnamon in a small bowl.
06 - Remove sweet potatoes from the oven. If desired, brush lightly with melted butter. Immediately sprinkle with cinnamon sugar while hot.
07 - Transfer to a serving platter and garnish with chopped parsley if using. Serve warm.