Color your buttercream with electric green gel paste; adding several drops at a time until the desired color is achieved.
Using a knife or decorating spatula frost your cupcakes covering all visible cupcake with Grinch green buttercream.
Immediately after frosting your cupcake, add a red heart quin to the center of the cupcake. Continue frosting until all cupcakes are Grinched. Eat & Enjoy!