01 - Set the oven to 425°F and line a large baking sheet with parchment paper.
02 - Toss the sweet potato rounds in a large bowl with olive oil and sea salt until evenly coated.
03 - Place the sweet potato rounds in a single layer on the prepared baking sheet, ensuring no overlap.
04 - Bake for 15 minutes, then flip each piece and continue roasting for an additional 12 to 15 minutes until edges are crisp and golden.
05 - Combine granulated sugar and ground cinnamon in a small bowl while the sweet potatoes roast.
06 - Remove the sweet potatoes from the oven. Optionally brush with melted butter. Immediately sprinkle cinnamon sugar evenly over the hot rounds.
07 - Transfer to a serving platter and garnish with chopped fresh parsley if desired. Serve warm.