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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Line a baking sheet with foil (line 2 sheets for 4). Wash and dry all produce.
Dice potatoes into ½-inch pieces. Core, deseed, and dice green pepper into ½-inch pieces. Halve and peel onion; cut one half into ½-inch-thick wedges (cut whole onion for 4). Mince cilantro. Zest and quarter lime.