Line a cookie sheet with foil. (A 15 x 9 inch is best but a little smaller one will do.) Place crackers side to side until bottom of pan is covered.
Melt butter in saucepan. Add sugar and bring to boil. Boil for 3 minutes. Pour over crackers and spread with knife or spatula to cover. Bake at 350 degrees for 15 minutes. Remove from oven and sprinkle chocolate chips over crackers. As they melt, smooth chocolate over top until crackers are covered. Add finely chopped pecans to top. Let completely cool (may need to refrigerate) then break into pieces. Delicious!