CUT potatoes lengthwise in half; place, cut-sides down, in foil-lined 15x10x1-inch pan. Bake 30 to 35 min. or until tender.
SCOOP out centers of potatoes into bowl, leaving 1/4-inch-thick shells. Add Neufchatel, milk, sugar and cinnamon to potato flesh; mash until well blended.
FILL shells with potato mixture; top with nuts. Bake 8 min. or until potatoes are heated through and nuts are toasted.
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