Heat oven to 350°F.

Line 9-inch square pan with foil, with ends of foil extending over sides. Reserve 20 wafers; finely crush remaining wafers. Melt 5 Tbsp. butter; mix with wafer crumbs. Press onto bottom of prepared pan. Bake 10 min.

Stand remaining wafers, top sides out, around sides of pan. Sprinkle marshmallows over crust. Bake 3 to 5 min. or until marshmallows are puffed.

Meanwhile, microwave peanut butter chips, honey and remaining butter in microwaveable bowl on HIGH 1 min. 15 sec. or until chips are completely melted and mixture is well blended, stirring after 1 min. Add nuts and cereal; mix well.

Press peanut butter mixture over marshmallows to completely cover marshmallows. Refrigerate 2 hours.

Melt chocolate as directed on package; drizzle over dessert. Let stand until chocolate is firm. Use foil handles to remove dessert from pan before cutting into squares.