Line a 10 X 15 sheet pan with foil and spray it with non-stick cooking spray.
Place your saltines on the sheet pain in a single layer.
Meanhwile, in a medium sauce pan, melt butter and brown sugar, and cook until bubbly.
Then pour butter/brown sugar mixture over saltines and then gently spread out evenly over crackers. Place in preheated 300 degree oven for 5 minutes.
Carefully remove from oven and sprinkle crackers with the chocolate chips. Lightly cover the hot baking sheet pan with a piece of foil to help melt the chocolate chips. (about 5 min)
Remove foil and with a spatula spread chocolate out onto crackers, and top with chopped nuts.
Place in freezer for 20-30 or refrigerator until chocolate is hard and set.
You can cut the Christmas Crack with a knife or break into pieces to eat. Enjoy!