I recently got this recipe and it is great for cupcakes but i hate that it uses the rubbing in method. Just give it a try.....1and a half cup self raising flour, half a cup of sugar, one third cup margarine, pinch of salt and a teaspoon of baking powder, one egg, one cup milk.....so you put all the dry ingredients in a bowl and rub in the margarine till it looks "bread crumby", add the beaten egg, milk and vanilla essence and mix well without beating. Bake at 180degrees. It yields about 12 cupcakes but I just double the recipe to get 24. Also, the lady who gave me the recipe said you could add another tsp of baking powder to your flour, and also you can use plain flour and double the baking powder!
I hope it helps.