Sprayed two 9-inch round cake pans with cooking spray.Add sliced snickers bars,1 cup chocolate chips and chocolate covered peanuts.
in a large bowl,beat cake mix,pumpkin,water,oil and 1 teaspoon pumpkin pie spice with electric mixer on low speed until moistened,then on medium speed 2 minutes,scraping bowl occasionally.Carefully spoon batter over chocolate mixture in each pan.
Bake 41 to 47 minutes or until cake springs back when touched lightly in center.Cool 5 minutes;remove from pans to cooling rack.Cool completely,about 1 hour.
To make Explosion Chocolate Frosting:in a large bowl,combine whipped topping,cream cheese,chocolate milk,hot chocolate mix,nutella and chocolate syrup,whisk together until blended and smooth.Set aside.
Place a cake layer on a serving plate,spread with half of the frosting.Top with milky way bar slices.Season with remaining pumpkin pie spice.
Place the second layer onto the cake and frost top and sides with remaining 2/3 frosting.Sprinkle with remaining chocolate chips all over the cake.Store loosely covered in refrigerator.