Line a jelly roll (15 x 10" with sides) pan with foil and grease lightly. Completely line pan with crackers. Boil butter and brown sugar for 3 minutes, stirring constantly. Pour mixture over crackers. Bake for 5 minutes at 350 degrees. Remove from oven. Sprinkle chips over pan. Let chips soften so they can be evenly spread. Sprinkle nuts over top. Refrigerate for 1 hour and then break apart into bite-sized pieces. Store these in the refrigerator. YUMMY!