Preheat oven to 400°
Prepare a 14"x19" pan by placing parchment on the bottom of the pan and coating the parchment with butter or baking cooking spray (not generic Pam spray)
In a large bowl, combine the flour, cocoa powder, and salt. Set aside.
In a large bowl, beat the eggs until light and fluffy. Add in the sugar and beat again (about 5 minutes). Egg mixture should hold soft peaks.
Add half of the dry mixture to the egg/sugar mixture, mixing until just combined. Add the 2nd half of the dry ingredients, mixing until just combined.
Pour the batter into the prepared pan, using a silicone spatula to gently press the batter into the corners. Bake for 10-12 minutes, cake is done when it begins to pull away from the sides of the pan and the top springs back when gently pressed with a fingertip.
Place a clean kitchen towel dusted with confectioner's sugar on top of the hot cake and another baking pan on top of the towel. Invert the stack onto a counte rtop. Slide the towel and cake off the 2nd pan and gently roll the cake up with the towel. Allow to cool 15 minutes on the counter top.
Gently unroll cake, remove towel, and fill with the peppermint frosting, re-roll the cake and refrigerate for 2 hours. Frost the outside with chocolate buttercream and decorate as desired.