Butter the sides of the 9x13 pan and lay a long sheet of parchment in the middle of the pan. Make sure the sheet is long enough that it hangs over both ends of the pan.
Melt the butter in the saucepan on medium heat.
Add about 10 ounces of the marshmallows, as they melt add the Irish cream, and vanilla extract, and continue to stir.
Once everything is melted, remove the pan from the heat, add 3-4 drops of green food gel color into it and mix it until it's all one color.
Quickly put in the rice cereal in the pan and use the spatula to combine the marshmallow mixture with the rice cereal.
Add at the rest of the mini marshmallows to have extra gooey treats.
Once combined pour the rice cereal mixture into the 9x13 baking pan. Use the spatula to smooth out the rice cereal treats and make sure the top is flat.
Wait and few minutes for the treats to set up a little. Butter the shamrock cookie cutter and use the cutter to cut shamrocks out of the treats.
Combine the left over treats to make more shamrocks. Set them all aside for later.
Heat the chocolate melts in the microwave at 30 second intervals, stirring in between until completely melted.
Dip the shamrocks in the Irish cream chocolate coating one half of the rice krispie treats and place them on a sheet of parchment paper chocolate side down. Place in the fridge for 20-25 minutes to solidify.
Warm of the left over chocolate, put it in a piping bag and pipe it in varying patterns across the rice krispie treat shamrocks.
While the chocolate drizzle on treats is still wet, add the sprinkles randomly to the treats.
Once the chocolate has set, serve and enjoy!