preheat oven to 180

beat the butter and brown sugar until light and fluffy

the eggs, one at a time, and mix until fully incorporated

combine the flour, baking powder, and cocoa powder before folding them inc

spoon the mixture into the flat bottemed ice cream cones half way up

poke a few mini oreos into each

bake in oven for 20 mins

allow cupcakes to cool

beat butter in a bowl until soft, then gradually mix the icing sugar before adding milk

transfer soft pale buttercream into a piping bag

pipe buttercream onto cooled cupcakes