Prepare 24 cupcakes as directed, using milk and 2 tbsp Irish cream in place of water. Since cake mixes differ, I am leaving that amount out, so adjust your nutrition facts accordingly.
My cupcakes baked approximately 14 minutes.
Push a Rolo upside down into the cupcakes while they are baked but still hot. This uses half the Rolos (put only one into each cupcake).
Allow them to cool completely.
Whisk together frosting until smooth.
Frost cooled cupcakes, topping with a right side up Rolo. Sprinkle with a small Hershey bar grated with a microplane.