In a large saucepan, cook potatoes in boiling salted water until tender; drain. Mash the potatoes with butter, milk, salt and pepper until smooth. Add cream cheese and onion dip; mix well. Spread in a greased 2-1/2-quart baking dish. Sprinkle with paprika.
Cover and refrigerate for 8 hour or overnight. Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 350 degrees for 50-60 minutes or until heated through.
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