Place a sleeve of saltines, spread flat, on a cookie sheet/jelly roll pan lined with aluminum foil or parchment paper (easy clean up)
Melt a stick of butter or margarine and a cup of brown sugar
in microwave, about 2 minutes. Stir to insure it has all melted.
Pour melted ingredients over saltines. Spread over all crackers as best you can with knife. Bake for 10 minutes. Remove. Pour semi-sweet chocolate chips over hot crackers. No set amount of chips, I use about half a bag per sleeve of crackers. Place back in oven for 2 minutes.
Remove from oven and spread melted chocolate over crackers with knife. Sprinkle with chopped nuts. Let cool and break apart.