Pinkie Pie has made a cookie replica of Ponyville for Sugarcube Corner's window display for the holidays. It has everything, including a little pony made out of gingerbread. When Discord brings the pony to life, it escapes and it is up the Mane Six and Spike to bring him back alive and uneaten.
So "Watch me gallop, watch me bolt! You can't catch me, I'm the Gingerbread Colt!"