Preheat oven to 350°F.
Spray (2) 9 inch round cake pans with non-stick cooking spray. Set aside.
Disregard instructions on the box. Place the cake mix, 4 eggs, stick of melted butter and 1 cup milk in a mixing bowl. Beat with an electric mixer for 2 minutes until well combined and there are no lumps in the batter. Batter will be slightly thicker than the regular cake mix batter your are used to.
Divide batter evenly between the two prepared cake pans.
Bake for 25-30 minutes. Cake is done when a toothpick inserted in the center comes out clean with no crumbs attached to it.
Remove cake rounds from the oven and allow them to cool in the pans to room temperature.
Once cakes are cooled scoop the chocolate frosting into a mixing bowl. Whip the frosting with a handheld electric beater until the frosting doubles in volume.
Remove a cooled cake round from baking pan and place it on a platter. Top with frosting. Add second layer of cake on top and frost the entire cake with the remaining frosting.
Press Kit Kat bars onto the side of the cake working your way all the way around the cake.
The frosting will act as glue and hold the candy bars in place.
Tie a length of ribbon around the cake and candy bars and tie it into a pretty bow.
Top the cake with a layer of sprinkles.
Refrigerate until ready to serve.