Prepare the oven by heating it to 350 deg F or 180 deg C. Grease the baking tin with enough butter or oil. Place a baking sheet at the bottom.
Mix all the dry ingredients (flour, sugar, cocoa powder, baking powder, baking soda) first. Then one by one add the rest of the ingredients (eggs, milk, oil, vanilla essence) except for boiling water.
Beat the batter on medium speed of a mixer till its smooth.
Next add the boiling water. At this point you may find it odd to look at, but just with the spoon mix the water with the batter slowly. Now it will become quite thin in its consistency.
Pour the batter into the baking tin up to its 3/4rth level.
Bake to 40-45 minutes or until wooden toothpick inserted comes out clean. Keep it aside till it cools down to room temperature.
With the help of a knife, scrape through the sides of the tin. Use an inverted plate to release the cake. Don't push through. Just tap at the back and sides if it feels a bit stuck.
Remove the baking paper and your cake is ready as it is.