Preheat oven to 350

Bake cake according to box

While cake is baking cut the marshmallows in half after cake is done cover the top of the cake with marshmallows and put back in the oven until marshmallows are golden brown. (usually about 5-10 min)

Put the icing in the microwave and melt until you can easily drizzle over the top of the cake. And crush Graham crackers

After marshmallows are brown drizzle icing over the top of the cake. Sprinkle Graham cracker and pecan over top