Umanoff & Parsons returned to Tribeca for three days before Thanksgiving to give locals a taste of what they’ve been missing since the popular bakery moved to bigger digs in the Bronx at the beginning of the year. Customers were disappointed there was not enough chocolate mud cake Tuesday, but owner Debra Seaton promised to make more for Wednesday, when she was expecting a mad sugar rush for the bakery’s pies and cakes.