Lovely chocolate frosting cupcakes

Versiunea in limba romana: Cupcakes cu crema de ciocolata

I had to prepare cupcakes for my son's party. What kind of cupcakes? "Chocolate, of course, mom!"  Judging by the fact that there were none left, and they dissapeared first, I could say these cupcakes were a succes :)  Divine chocolate... ♥

100 g flour, sieved + 20 g cocoa powder, sieved + 100 g sugar + a pinch of salt + 1 1/2 tsp baking powder
40 g unsalted butter, at room temperature
120 ml milk + 1 big egg + 1/2 tsp vanilla extract
Chocolate frosting
Prepare a tray of cupcakes (12 big or 24 small cupcakes).  Heat the oven to 170 degrees Celsius.  Mix well flour, cocoa, sugar, salt and baking powder. Add the butter and mix well. In another bowl mix the milk, egg and vanilla. Pour half the liquid over the dry mixture of flour and mix with high speed mixer, until smooth. Add the rest of the liquid and mix a little, until just incorporated. Avoid mixing too much.
Bake for 20-25 minutes. Test: a toothpick inserted in the cupcakes must come out clean. Let the cupcakes cool completely on a grill rack. When cooled, add the chocolate frosting.

Chocolate frosting: 250 g confectioner's sugar + 100 g unsalted butter, at room temperature + 40 g cocoa powder, sieved + 40 ml milk

Mix sugar, butter and cocoa with a medium speed mixer. Slowly add the milk and mix well, at slow speed. When milk is completely incorporated, beat with the mixer on high speed until light and fluffy.  Play with the sugar or liquid quantity in order to obtain the desired consistency.