• Preheat the oven to 175degrees.
• Line the cupcake tray with liners and keep aside.
• First, beat the butter and sugar until fluffy. (it took 5minutes for me) Add eggs slowly one by one and mix on low speed.
• In a bowl, add cocoa powder, red colour and vanilla. Mix well and add it to the butter batter.
• In another bowl, add salt and milk together. Keep it aside.
• Slowly add flour and milk alternately to the butter mixture and mix well on low speed.
• Add vinegar to the baking soda and mix well immediately. Add it to the mixture and mix on low speed for 2 minutes.
• Bake for 18-20 minutes or until the skewer comes clean.
• Transfer them on to wire rack and allow to cool completely before icing.

For Cream cheese frosting:

Mix cream cheese and butter on high speed until it is smooth. Add vanilla extract and slowly add icing sugar. Mix well until all are mixed well.

Here I used the star tip.