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Adjust rack to middle position (middle and top positions for 4 servings) 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, 1⁄4 tsp garlic powder (1⁄2 tsp for 4), and 1 TBSP water (2 TBSP for 4). (You’ll use more garlic powder later.) Microwave until warmed through, 30 seconds.