Fill your cocktail shaker with ice, toss in the vodka and bailey's and shake vigorously (the longer the better. It should be FREEZING cold and well agitated).
Rim a lowball glass with marshmallow cream, and dip immediately in graham cracker crumbs.
Place 2-3 ice cubes in your glass, pour liquor mixture overtop, fill the rest of the glass with milk.
Take a torch lighter and toast a marshmallow on one end, be careful! If you don't have one of these nifty lighters, place your marshmallow in a small pan, over medium heat, and toast until browned (1-2 minutes).
Top drink with your roasted marshmellow & enjoy!