I started by baking and stacking three 9" x 13" cakes. I didn't worry about getting the filling icing all the way to the edge since they would be trimmed off anyway.
After stacking and refrigerating the cakes I cut it into a potato shape. Starting by just making the vertical cuts, then going back and rounding the edges.
I chilled the cake again then put a nice layer of vanilla buttercream over the entire thing. While it was chilling again, I rolled out the fondant and prepared to cover the cake.
I used the marshmallow fondant recipe that I show here to make both the chocolate fondant for the potato and the colored fondant for the toppings. I made a full batch for the brown, and only a quarter batch for the toppings. To cover the potato I rolled the fondant out into a pretty even layer then wound it back around the rolling pin to unwind it over the cake. Then I just smoothed it down and trimmed the excess.
Then it was time to make it look like the potato skin was peeled back. I cut out an oval of fondant then split the edges and pulled them back. A little more icing in the middle made the potato filling and I kinda swirled it around to make it fluffy. To really try and make it look like a baked potato, I dabbed some cocoa powder to the fondant to give it that kind of dry/dirty look.
I had a lot of fun making this cake and am very happy with the result. That's it for tonight, I hope you all have a great 3 day weekend!