Coca Cola Cupcakes with Cola frosting 

Dice the butter and add to a saucepan with the coca cola and espresso powder and melt on medium high heat 

Take the pan off the heat and stir in the baking soda and let it cool down 

In a large bowl sift the flour sugar and cocoa powder

In another bowl whisk the eggs buttermilk and vanilla 

Add all the liquids to the dry ingredients and mix them well then fold in the chocolate chips 

In a saucepan melt the butter and coca cola together on medium high heat 

Add the vanilla  powdered sugar cocoa powder and ground hazelnuts and beat with an electric mixer until fluffy . If the mixture is stiff add 1/2 tsp of coca cola and loosen it up

Put the frosting into a piping bag fitted with a star nozzle and pipe onto the cupcakes when they have cooled down . I like to decorate mine with cola bottle sweets afterwards 