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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry all produce. Place 1 TBSP butter (2 TBSP for 4) in a small bowl; bring to room temperature. Peel and dice potatoes into ½-inch pieces (for speedier spud prep, skip the peeling). Mince or grate garlic. Finely chop parsley leaves and stems.