Line a cookie sheet or jelly roll pan with foil and butter it well. Fill the pan with soda crackers.
Put the butter and sugar in a pan and boil together for 3 minutes then pour over the crackers and spread it around to cover them all.
Bake in a 400 degree oven for 4 minutes. Take out and immediately sprinkle with the chocolate chips. Let sit for a couple of minutes and then spread the chips around until the entire pan is covered with chocolate. Sprinkle with the walnuts.
Score the pan of cookies. Cool completely and cut where you scored and store in an airtight container.