Spread across round tables in a dimly lit room in Manhattan’s Upper East Side, New York City lives in sugary miniature. On one table, a Brooklyn brownstone stands with a peppermint trim and snowy frosting; on another sits Queens’ iconic 7 train, complete with a Christmas wreath of green gummy bears. These elaborate confections are entries in “Gingerbread NYC: The Great Borough Bake-Off,” a competition that challenged bakers from across the city’s five boroughs to capture their beloved neighborhoods in gingerbread. The exhibit is hosted by the Museum of the…