Place the ground walnuts, syrup and brown sugar in a small bowl; mix well. Scoop teaspoonfuls and form into 24 balls; transfer to a waxed paper-lined baking sheet. Chill.
Meanwhile, in a microwave, melt chips; stir until smooth. Set aside. In a large bowl, beat cream cheese and butter until smooth. Beat in melted chips and maple flavoring; mix well. Refrigerate for 1 hour or until set.
Shape tablespoonfuls of cream cheese mixture around each walnut ball. Roll in chopped walnuts. Refrigerate for 2 hours or until firm. Store in an airtight container in the refrigerator.
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