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Adjust rack to top position and preheat oven to 450 degrees. Wash and dry produce.
Trim and thinly slice scallions, separating whites from greens. Trim green beans if necessary.
In a small microwave-safe bowl, combine hoisin, ¼ tsp garlic powder (½ tsp for 4 servings), and 1 TBSP water (2 TBSP for 4). (You’ll use more garlic powder later.) Microwave hoisin glaze until warmed through, 30 seconds.