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Preheat the oven to 500°F. Line a heavy large baking sheet with foil and spray the foil with nonstick spray.
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Place the peaches, skin side down and side by side, in the center of the prepared baking sheet and sprinkle the brown sugar over the peaches.
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Roast for 25 minutes, basting once with the melted brown sugar, or until the sugar caramelizes and the peaches are golden and slightly softened.