To create Christmas crack, first gather all the ingredients: a can of sweetened condensed milk, a bag of saltine crackers, and a box of graham crackers. Preheat the oven to 400 degrees F. Spread the sweetened condensed milk evenly over the saltine crackers. Then, line the graham crackers on top of the sweetened condensed milk. Place in the oven for 10 minutes. Remove from oven and let cool. Once cooled, break into pieces. Enjoy this delicious and festive treat!