First, you need to make the cake. For that, preheat the oven to 180-degree centigrade
Take two cake pans ( 8-9 inches) and grease it well. Consider lining the bottom of the pan with a parchment paper
Take a clean bowl and mix flour, baking soda, cocoa powder, cornstarch, and salt. Keep it aside
In the next level, mix butter and sugar with the help of a standing mixer. Beat it on the medium heat until the texture gets light and fluffy
Within 3-4 minutes, you will get a perfect consistency. Consider putting oil. Add eggs to the mixture ( one at a time)
Mix the eggs properly and then add vanilla extract to it. Beat the mixture properly so that there will be no lump
When the eggs get properly mixed, put the oil in it and consider combining it. After that, add red food color, vanilla extract, and vinegar to the mixture and beat everything properly
Now, add buttermilk to the dry ingredients and make sure that there is no lump in the batter
It’s the time to place the cake batter on the cake pan. Spread the batter evenly on two prepared cake pans
Allow it to get baked for 25-30 minutes (approx). After that, insert a toothpick into the cake and check whether it comes out clean
Keep the cake on a wired rack to get cool