Step 1: Preheat oven to 450 degrees Fahrenheit. In a medium bowl, toss potatoes, oil, wine, thyme, and salt.
Step 2: Spread out in a single layer on a baking sheet and bake until very tender, about 40 minutes.
Step 3: In a large bowl, whisk together oil, sour cream, vinegar and horseradish. Season to taste with salt and pepper.
Step 4: Add warm potatoes to dressing and toss to coat. Divide among 4 plates and top each with a handful of watercress.
Step 5: MAKE AHEAD: The dressing can be covered and refrigerated for up to 5 days.
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