This is a classic chocolate buttercream icing for all your desserts. Buttercream lasts in the freezer for a few months, freeze any leftover to use later.
Add more sugar if your icing is too soft or too buttery for your taste.
As you add your melted chocolate keep tasting the icing to reach your desired richness for the icing.
You can freeze any left over icing to use on other desserts, or cookies for up to 3 months.