Preheat oven to 400 degrees. Line a jelly roll pan with parchment paper, then line that with Saltine crackers. In a saucepan, melt butter and sugar and bring to a boil for 2 minutes. Remove from heat and stir in vanilla. Pour caramel over the crackers, spread evenly. Bake for 6 minutes. While it's baking, unwrap your chocolates and melt them in a microwave in 30 second increments, stirring in between. Smash up the graham crackers in a baggie. Remove the pan from the oven and spread the chocolate over the top. Top with marshmallows and graham crackers. Broil for 1 minute for marshmallows to brown or use a torch. Refrigerate for at least two hours before breaking into pieces.
Recipe by Honeybear Lane at https://www.honeybearlane.com/2014/07/smores-crack.html