Spray a microwave safe bowl with non-stick spray. Crumble your graham cracker sheet into the bowl. Next, you can mix all the ingredients together in the same bowl for the cake.. Pop it in the microwave for approximately 90 seconds to 2 minutes, depending on your microwave. Flip the cake out onto a plate to add the icing if you prefer or eat it all in the bowl.
While that is cooking, mix all of the icing ingredients in small bowl and pour over cooled or warm cake. Enjoy!