Red velvet cupcakes

Ingredients

• 60 gm butter
• 150 gm granulated sugar
• 1 egg
• 25 gmcocoa powder
• 3 tsp vanilla extract
• 130 ml buttermilk
• 150 gm flour
• 1 tsp baking soda
• 1,5 tsp apple cider vinegar
• Red dye
• 300 gm powdered sugar
• 50 gm unsalted butter
• 125 gm cream cheese