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Adjust rack to middle position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry all produce.
Peel and dice sweet potatoes into ½-inch pieces.
Reserve 1 tsp maple syrup for sweet potatoes (2 tsp for 4); pour remaining into a small bowl. Stir in a pinch of salt and chili flakes to taste. Set aside.