Heat the oven to 175ºC/350ºF.
Grease and line with paper 2 x 8in baking pans. Use pans which have solid bottoms preferably as this is a very thin mixture and it can leak out of loose bottom pans.
Sift dry ingredients into a large bowl.
Mix together eggs, milk, oil, and vanilla, and add to the dry ingredients
Beat for 2 minutes on medium speed.
Stir in boiling water. (Please note the batter is very thin.)
Pour into prepared baking pans and bake for 30-35 minutes.
Cool in pans for 10 minutes before removing onto a wire rack.
Decorate with either a chocolate ganache icing or soft buttercream icing