1Heat oven to 350°F. Spray bottom of 13x9-inch pan with cooking spray.
2In large bowl, stir cookie mix, butter and egg until soft dough forms. Press dough in bottom of pan using floured fingers.
3Bake 15 minutes. Sprinkle with butterscotch chips, chocolate chips, coconut and walnuts. Drizzle evenly with condensed milk.
4Bake 30 to 35 minutes or until light golden brown. Cool completely, about 2 hours. For bars, cut into 9 rows by 4 rows.