Break open all the eggs into a mixing bowl and start beating them using an electronic blender. Beat until the eggs foam up. Set them aside.
Take another mixing bowl. Place a sieve over it. Add the dry ingredients. Whole wheat flour, Baking Powder, Baking Soda, Vanilla powder, Powdered sugar and sift the mixture.
Mix them so that all the powders blend well.
Add in the foamed egg. Add in the butter. Add in milk in portions and start mixing them.
Keep adding milk and mixing until a flowy thick batter is ready.
Grease the baking tin with generous oil or butter.
Add in the cake batter. Tap the baking tin so that the air bubbles would escape.
Place the cake tin into the Oven and bake for 40 minutes at 180 deg c.
Insert a skewer into the cake to check if the skewer comes out clean. Else bake again for 10 minutes.
Take the cake out. Allow it to cool down completely. Use a knife to release the sides of the cake. Invert the cake tin and take the cake out.
Slice the cake and serve them.
Video
Notes
After Beating the eggs and foaming up the egg mixture do not leave it idle for more time or the air incorporated into the eggs might escape and you may not get the desired foamy cake.
Baking time completely depends on the Microwave used and the Size of the Baking tin used. Hence read your oven user manual carefully before you start baking.
Do not slice the cake when it is hot it would crumble.
Make sure all the ingredients are in room temperature before you start making a cake.
If you don't have a electronic blender then use the whipping blade in the mixie to beat the egg.