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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Peel and dice potatoes into ½-inch pieces. Peel garlic. Trim and halve Brussels sprouts lengthwise. Halve, peel, and thinly slice shallot. Zest orange until you have ½ tsp (1 tsp for 4 servings); halve orange. Pick half the sage leaves from stems (all the leaves for 4); thinly slice leaves until you have 1 tsp (2 tsp for 4). Roughly chop dried cranberries.