Grind white sugar and brown sugar together in a mixer jar. Grind to a fine powder.
In a large bowl add soft butter (butter should not be too soft as u can see it oily and shiny). Just soft to touch. Sieve all the dry ingredients (flour, sugar, cocoa powder, baking soda, baking powder)together. Add these dry ingredients to the butter bowl. Then add the eggs and beat for 1 minute. Use an electric hand beater.
Then add the orange zest and orange juice and mix for another 1 min. The cupcake batter is ready. Line all the cupcake moulds with the cupcake liners. Add the batter to the liners till 3/4 filled. Bake at 170°c for 20 mins. Check with a toothpick.
Take out the cupcakes from the moulds immediately on a cooling rack and let it cool. The cupcakes should be completely cooled before using butter cream.
Buttercream: Beat butter for 5 mins till it is soft and pale. (Remember that u should start with soft butter and not oily butter). Sieve the icing sugar to remove lumps if any. Add this to the beaten butter in 2 batches. Beat for another 5 mins till it forms stiff peaks. Add orange zest and orange juice and then beat for another 1 min. Buttercream is ready.
Pipe the buttercream in a piping bag and decorate the cupcakes according to your choice. Garnish with some grated orange chocolates. Serve for any occasion or party or eat it just like that.
