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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce.
Dice sweet potatoes into ½-inch pieces. Trim and quarter mushrooms. Core, deseed, and dice bell pepper into ½-inch pieces. Zest and quarter lime. Trim and halve cucumbers lengthwise; thinly slice crosswise into half-moons.