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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Wash and dry produce.
Dice sweet potato into ΒΌ-inch pieces.
Drain and rinse chickpeas; thoroughly pat dry with paper towels. On a clean flat work surface, place chickpeas between 2 large pieces of plastic wrap. Smash with a mallet or the bottom of a pan until broken apart (chickpeas should not be completely mashed).