Sieve Maida and baking powder together. Keep it aside. In a bowl cream the sugar and butter. Beat it in one direction using a cake spatula till light and fluffy. Beat eggs (just 1 spin in the mixer).Add some beaten eggs to the sugar-butter mixture and mix properly. Repeat till all the beaten eggs are mixed properly with the sugar butter mixture. Fold in some sieved Maida and baking powder mix. Repeat for the rest of the Maida. Add milk. The mixture should be of dropping consistency. Adjust the amount of milk accordingly.Add Vanilla essence and mix properly.Add the dried Cranberries and mix. Divide the mixture into two. Keep one portion as it is. To the other half add Cocoa powder and mix well. Grease a round (any shape will do) baking pan, dust it with Maida.Alternatively put 1 spoon of the Vanilla and Cocoa mixture in the pan.Bake it in a preheated oven at 180oC for about 35-40 minutes or till a knife inserted in the cake comes out clean.Cool on a wire rack.