1Preheat oven to 375^. Spray a 9x13-inch baking pan;set aside.
In medium bowl of mixer; beat peanut butter, banana, oil and water together on medium until smooth. with just a few small pieces of banana lumps.
Beat in eggs, cocoa powder and cake mix on medium high for one minute, until well blended, add a little more water if desired (batter will be thick), Fold in peanuts.
Pour into prepared pan .Bake for 35 minutes or tested done with toothpick. Cool on wire rack.
2Make Chocolate Glaze:
In a safe bowl, microwave whipping cream on high 1 minute and 30 seconds. Remove and add the chips; let stand 2 minutes. Stir until smooth.
Pour over top of cake. Spread evenly.
3Make Marshmallow Glaze:
In a small bowl, stir 1 Tablespoon of the boiling water into marshmallow creme until smooth.
If glaze is to thick, stir in the remaining boiling water to make a glaze. Pour Marshmallow Glaze over chocolate glaze.
Sprinkle with crushed nuts and dried banana chips on top.