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Adjust rack to middle position and preheat oven to 400 degrees. Wash and dry produce.
Peel garlic; place whole clove in the center of a small piece of foil. Drizzle with olive oil and season with salt and pepper. Cinch into a packet. Trim and halve Brussels sprouts lengthwise. Dice potatoes into ½-inch pieces. Thinly slice chives.