Preheat oven to 350 degrees F
Line a baking sheet with foil (or parchment paper) and spray with nonstick cooking spray.
Lay out saltines on the baking sheet so that they cover the pan, making sure they are all going in the same direction.
In a medium saucepan, over medium heat, let butter and brown sugar melt and bring the mixture to a boil.
Once boiling, reduce heat to medium low and let it simmer for approx 5 minutes. Don't over cook the toffee mixture, it will burn and then it will be ruined : (
Remove pan from the heat and slowly pour the mixture over the crackers evenly.
Place the baking sheet in the oven for 5 minutes.
Once done, remove pan from oven and top with chocolate chips (evenly) on the saltine/toffee sheet.
As the chocolate melts, using a butter knife or non stick spatula, spread the chocolate across the top of the toffee.
Add your favorite toppings to the chocolate.
Let the Christmas Crack cool completely (in the refrigerator works best to cool it quickly).
Break the bark into smaller pieces.