Line a baking sheet with foil and arrange the saltine crackers in a single layer.
In a saucepan, combine 1 cup of butter and 1 cup of brown sugar. Bring to a boil and cook for 5 minutes.
Pour the butter-sugar mixture over the crackers.
Bake at 350°F for 7 minutes.
As soon as the crackers come out of the oven, top with a whole bag of chocolate chips.
Spread the chocolate chips evenly over the crackers.
Top with walnuts (optional).
Refrigerate until set, then crack the sheet into pieces.
