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Preheat oven to 450 with racks in upper and lower thirds. On a rimmed baking sheet, toss mushrooms with 1 Tbs. oil; season with salt and pepper. On another rimmed baking sheet, toss potatoes with 1 Tbs. oil; season with salt and pepper. Roast until mushrooms are browned and potatoes are cooked through, about 20 minutes, tossing once and rotating sheets halfway though. Transfer to a bowl and toss with parsley and vinegar.
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