Chocolate cake cupcakes and buttercream frosting

https://www.tasteofhome.com/recipes/buttermilk-chocolate-cupcakes (makes 24 cupcakes)

https://addapinch.com/perfect-chocolate-buttercream-frosting-recipe/ (1/3 recipe is adequate)

I used 1/3 of the cocoa called for in the frosting recipe. It has too much IMHO. These were for Ila's birthday