Preheat the oven to 350°F & Prepare your cake pans with a light spray of pan grease
In a large mixing bowl combine the flour, baking soda, salt & sugar (substitute). Whisk to combine well
In another mixing bowl combine the cocoa powder with the hot coffee & whisk smooth
Add the vegetable oil, vanilla extract & vinegar, then add all of these liquids to the dry ingredients in the mixing bowl.
Whisk vigorously to combine well, the batter will seem thick at first but be sure to keep whisking smooth
Divide the batter into your "twinkie" pan filling 3/4 of the way to the top
Bake immediately in a preheated 350°F oven for approximately 15-18 minutes or when they are springy to the touch when you gently press the centers
Cool in the pan until you can easily touch them without burning yourself.
Then flip the cakes out onto a cooling rack to cool to cold. Slice the cakes in half lengthwise
Prepare the low sugar buttercream recipe according to the recipe post OR make your favorite buttercream recipe
Fill the Devil Dog Cakes with a small amount of buttercream in each one