1. Heat the up the green chocolate melts in the microwave. Heat the chocolate in 30 second intervals, and stir in between each interval until the chocolate is completely melted. 
2. Dip the marshmallows in green chocolate using a toothpick, scrape off the excess chocolate and put the marshmallow on parchment paper to let them dry. Repeat for each marshmallow.
3. Next separate the sandwich cookies and dip the cookies with no cream in the green chocolate, place them on the same sheet of parchment. 
4. While the chocolate on the cookies are still wet, place a chocolate covered marshmallow on top of each one. Allow them to dry. 
5. Melt the black chocolate following the same instructions as above and put it in a piping bag. Cut a small hole on the tip of the bag.
6. Use the black chocolate to cover the line of separation between the marshmallow and cookie. Pipe the chocolate around the bottom of marshmallow and use tweezer to add sprinkles to the black chocolate. That will be the front of the hat.

Making the Buttercream:

1. Add the butter to the mixing bowl and whip the butter until light and fluffy. About 3 minutes.
2. Add the powdered sugar, vanilla, 3 drops of orange gel color and Irish Cream and mix on low.
3. Slowly pour the heavy cream down the side of the bowl as its mixing.
4. Mix until the buttercream is fluffy and smooth.
5. Put the piping tip in the piping bag and cut a hole on the tip of the bag, make it big enough for the top portion of the piping tip to fit through. 
6. Add the buttercream to the piping bagged secure the end.
7. Pipe swirl on top of the cupcake
8. Optional Add more sprinkles to the buttercream.
9. Put the hats on top of each cupcake, Serve and Enjoy!