1Heat oven to 350°F. In large bowl, stir cookie base ingredients until soft dough forms. Spread dough in bottom of ungreased 13x9-inch pan. Bake 12 to 15 minutes or just until set. Cool completely, about 30 minutes.
2In large bowl, beat cream cheese and 1/4 cup sugar with electric mixer on medium speed until smooth. Fold in whipped topping and candies. Spread over cooled cookie base.
3In small microwavable bowl, beat peanut butter, milk and 2 tablespoons sugar with wire whisk until smooth. Microwave uncovered on High 30 to 60 seconds, stirring after 30 seconds, to thin for drizzling. Drizzle mixture over filling. Drizzle with melted chocolate. Sprinkle with peanuts. Refrigerate about 1 hour or until set. For bars, cut into 6 rows by 4 rows. Store covered in refrigerator.