Horseradish Mashed Potatoes with Caramelized Onions

Yield: 1 Servings
Categories: Potatoes
1/4cButter
6tbButter
2 1/4lbVidalia onions; thinly sliced
3tbBalsamic vinegar
2tsChopped fresh thyme
3 1/2lbRusset potatoes; peeled, cut in 1/2" pieces
6tbWhole milk; to 8 tbsp
1/4cHorseradish
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