Melt butter in a thick bottom pan. Cool it and add Condensed Milk. Mix it well.
Shift Maida, Cocoa powder, Baking powder, Cooking Soda and Salt together. Ensure there are no lumps.
Grease the baking tray with little butter and dust it with Maida. Keep it aside.
Take the pan with the butter. Gently fold in the dry flour and Aerated cola alternately until the flour and cola are done.
Pour the batter into the greased baking tray and microwave it for 5 mins. Its done, still you can keep it for 2 mins on dual. Once done, you can check by inserting a knife in the middle of the dish. If the knife comes out clean, the cake is done!
Topple it over the baking rack and let it cool for few mins, before icing it.
Take a bowl, add icing sugar and butter. Whip it well until its nicely mixed. Spread this on the cake once its cooled a bit, else the icing sugar will melt.
Fresh Cream also can be whipped with beater until it comes out frothy.
I normally decorate it with whipped cream and Chocolate fudge. Finally, grate eating chocolate on the top.