Mix all ingredients until smooth. Add more milk or more powdered sugar as needed to get the desired consistency.
Pipe onto cupcakes.
Then top with chocolate ganache. To make the ganache, pour one cup of chocolate chips into a bow. Heat 1/2 C heavy cream to almost a boil in the microwave. Pour it over your chocolate chips and let them sit for about 2 minutes. Then stir and allow it to cool for about 10 minutes, then drizzle on the cupcakes.
Sprinkle with mini chocolate chips.