In a large bowl, combine peanut butter cookie mix, vegetable oil, water, and egg.

Press into the bottom of a lightly greased 9x13 pan.

Bake at 350°F for 10-13 minutes, or until the edges are golden brown.

Sprinkle the marshmallows evenly over the hot crust, and return to the oven for 1-2 minutes, or until marshmallows begin to puff.

Remove from heat to a wire rack, and set aside.

Meanwhile, in a large saucepan, combine the peanut butter chips, corn syrup, and butter.

Cook over medium heat, stirring frequently, until the chips are completely melted, and the mixture is smooth.

Remove from heat, and fold in the peanuts and Rice Krispies cereal.

Carefully spread over the marshmallow layer.

Cool completely on the wire rack.

Cut into bars, and enjoy!