Chervil is an aromatic, mild-flavored herb that's a member of the parsley family. It lends a slight anise flavor to this dish.
Place first 3 ingredients in a large saucepan; cover with water. Bring to a boil; cook 20 minutes or until very tender. Drain.
Return potato mixture to pan. Add broth and next 4 ingredients (broth through pepper); beat at medium speed of a mixer until smooth. Stir in chestnuts.
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