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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry all produce. Cut potatoes into ½-inch-thick wedges. Core, deseed, and finely dice bell pepper. Halve, peel, and finely dice onion. Place garlic cloves in the center of a small piece of foil; drizzle with olive oil and season with salt and pepper. Cinch into a packet.