Cut the cookie dough into circles and place on cookie sheet. Bake as directed for approximately 6 minutes or until cookies are just over half baked.
Meanwhile, cut marshmallows in half, and break the chocolate bar into individual squares.
Remove cookies from oven and place 1 piece of marshmallow in the centre of each cookie. Place back in the oven and bake for another 2 minutes or until marshmallows are puffed and cookies are almost golden brown.
Remove trays from oven, and wait 30 seconds for marshmallows to fall a bit (so they won't cover the chocolate). Drop 1 chocolate square in the centre of the marshmallow on each cookie. Return to oven for 1-2 minutes, or until cookies are baked and chocolate is just slightly melted.
Remove from oven and cool.
Use a toothpick to "draw" on red lines into the mashmallows to give the look of blood shot eyes.
ENJOY!