Scrub and dry potatoes, then prick several times with a fork and place on a microwave-safe plate. Heat in microwave on high until tender, 18 to 20 minutes; remove and allow to cool for 10 minutes.

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Combine Neufchatel cheese and milk in a small bowl; beat in salad dressing mix.

Cut potatoes in half lengthwise; remove pulp, leaving a thin potato skin shell. Mix pulp into cheese mixture and mash. Spoon mixture into potato shells; sprinkle with Cheddar cheese.

Place two potatoes on a microwave-safe plate. Heat in microwave on high until heated through and cheese is melted, 3 1/2 to 4 1/2 minutes.