In a Mixer jar Blend Biscuits. Make a smooth even powder. Transfer that in a bowl. now add Sugar, Vanilla Essence, and Milk. Mix nicely. Batter consistency should not be too thick or thin. Now add Fruit salt, mix well .
Pour this batter in a greased cake tin. If using Microwave, microwave for 5 mins on high. Keep checking after 5 mins as each microwave is having different power consumption. To check whether cake is done or not, insert a wooden toothpick into center of cake. If toothpick comes out clean, cake is ready else cook for more 1-2 mins.
I made this cake in cooker, so it took exactly 35 mins to bake on slow flame.When done take out the cake and allow it to turn cool on rack. Once fully cool dust with some powder sugar and sugar balls.
One can garnish in thousands of way, but I guess this is the simplest and coolest way to make cake attractive ..