My son's birthday is coming up and I need an easy, tasty vegan AND nut free special treat to bring to his class.
This chocolate cake (from Martha Stewart's website) is really good! I have made it into 12 regular-sized cupcakes and it worked just as well.
I agree with saragrad, that's totally the best cake you can make and it makes really good cupcakes. If you want to make it a little more moist you can add about 2TBS of chocolate syrup to the batter. It's usually called "depression" or "wacky" cake (depression era cakes have a tendency not to include as many rationed ingredients, like eggs, milk, butter, etc. so they're a great place to start looking when you want to make something vegan).