-Preheat oven to 350 F; coat a 13x9-inch baking pan with nonstick spray.
-Pulverize cookies in a food processor until fine crumbs form. Add melted butter; process until crumbs clump together. Press crumbs into prepared pan. Bake 15 minutes or until golden.
-Melt peanut butter chips, corn syrup, butter, and vanilla in a saucepan over medium-low heat, stirring until smooth, about 5 minutes. Spread 1/2 cup of the peanut minture over crumb base.
-Top with marshmallows and return bars to the oven. Bake until marshmallows puff, about 2 minutes, then remove from oven. Don't let marshmallows brown or they'll turn crunchy.
-Toss peanuts and cereal with remaining peanut mixture to coat. Drop spoonsful of the topping over the marshmallows, then spread with a spatula (sprayed with nonstick coating). cool bars before cutting with a knife coated with nonstick spray.