preheat oven to 375° and line an 8 x 8 square pan with aluminum foil, enough so that some of the foil hangs over the edge of the pan.

crush the Graham crackers and mix in the melted butter and sugar. pour into the aluminum foil lined pan and push down with a glass cup to make an even layer. bake for 15 minutes or until the edges are golden brown.

melt the chocolate in small sauce pan over medium low heat and add half a can of sweetened condensed milk and the vanilla. once it is smooth, pour immediately over the graham cracker crust.

melt the white chocolate chips in a small sauce pan over medium low heat and add in the marshmallow fluff and the rest of the sweetened condensed milk. stir until it is smooth and consistent. immediately pour over the chocolate layer.

refrigerate overnight. the next day pull the fudge out of the pan using the aluminium foil. gently remove the foil and carefully cut into squares. store in the refrigerator if you don't eat it all right off the cutting board.