After going to Sugercube Corner, Derpy finds out that they didn't get a shipment of the ingredients needed for the best muffins in the world. Derpy goes on a epic quest, and unbeknownst to her, her children decide to follow. Now Derpy, Dinky, Sparkler, and Dizzy Hooves are all on the ride of their lives, and it will involve muffins. Lots and lots of muffins.
Credit to StarryOak on Deviantart for the picture and help with the story. Also credit to hlissner on Deviantart for the locations in the story http://hlissner.deviantart.com/art/Equestria-and-beyond-rev-8-1-253465186