Line a 9 x 13 inch cake pan with tin foil. Butter the foil. Lay saltine crackers on top. Boil 1 cup brown sugar and 1 cup of butter for 3 minutes. Pour gently over crackers and bake for 7 minutes at 350 degrees. Remove from oven and sprinkle 12 ounce package of chocolate chips over the top. When melted, spread with knife and sprinkle chopped pecans on top. Cut and eat.