1Heat oven to 350°F. In large bowl, beat brown sugar, 1 cup butter, the vanilla and egg with electric mixer on medium speed, or mix with spoon. Stir in flour. Press evenly in bottom of ungreased 13x9-inch pan. Bake 20 to 22 minutes or until light brown. Cool 20 minutes.
2In 1-quart saucepan, heat corn syrup and 2 tablespoons butter over medium heat, stirring occasionally, until mixture boils. Stir in chips until melted.
3Immediately spread butterscotch mixture over baked layer. Sprinkle with candies and nuts; gently press into butterscotch mixture. Cool at least 2 hours until butterscotch mixture is firm (do not refrigerate). For bars, cut into 8 rows by 4 rows.