Preheat oven to 350 degrees; coat a 13 inch by 9 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 mixture 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 spoonfuls of the topping over the marshmallows, then spread with a spatula (sprayed with nostick coating to prevent sticking). Cool bars before cutting with a knife coated with nostick spray.