Beat the 1/2 cup of butter together with a brown and granulated sugar until light and fluffy. This is 6-8 minutes with a good electric mixer .
Add in the milk and vanilla . Beat until incorporated.
Add in the flour and salt. Beat at low speed till mixed well. Scrape the bowl well.
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Fold in the chocolate chips. Your cookie dough is ready. You can top your cupcakes with this and skip the following steps. Also , If you have any buttercream , mix equal parts of this cookie dough and buttercream for a cookie dough frosting.
If you don't have any buttercream or frosting , we ' ll make a quick American style buttercream base ! Beat the 1/3 cup of butter until light , fluffy and pale.
Add in the sifted icing sugar , about 1 tablespoon at a time and beat well after each addition.
Once all the icing sugar is added , beat for a couple more minutes.
Mix this buttercream with the cookie dough frosting . Your smooth cookie dough frosting is ready!!