Preheat the oven to 180 degree Celsius
Grease your cake pans with butterand flour to make sure that the cake does not stick while baking and comes outeasily
Prepare your buttermilk by addingthe vinegar (1 tbsp) into the milk (125 ml) and let it sit for 10 minutes
In a bowl, combine all your dry ingredients: flour (120 gms), white sugar (100 gms), brown sugar (100 gms), cocoa powder (38 gms), baking powder (1 tsp), baking soda (3/4th tsp), salt (1/2 tsp), and coffee powder (1/2 tsp) using a hand whisk
In the same bowl, add the buttermilk, oil (60 ml), egg (1), and vanilla essence (1 tsp), and mix on medium speed using an electric or stand mixer (use a paddle attachment if usinga stand mixer) until everything is well combined. You will have a thick batterat this point.
With your mixer on low, pour the boiling water (125 ml) into the batter and keep mixing until the water is well incorporated. Be careful at this step, the water may splash if the speed of your mixer is too high. After this step, you will end up with a thin batter. Don’t worry, it’s meant to be this way.
Pour the batter in your cake pans and bake for 30 mins or until a test toothpick comes out clean