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Adjust racks to top and middle positions and preheat oven to 425 degrees. Bring garlic herb butter to room temperature. Wash and dry produce.
Slice potatoes into ΒΌ-inch-thick rounds (no need to peel). Trim green beans if necessary. Trim and thinly slice scallions, separating whites from greens. Roughly chop pistachios. Zest and quarter lemon.