Allow the cake to cool completely, then use the handle of a wooden spoon to poke several holes in the cake.
Fill each hole halfway full with caramel sauce, then top the caramel sauce with chopped peanuts. Set aside the remaining peanuts to sprinkle on the top of the cake.
Carefully spread the chocolate frosting over the top of the cake.
Decorate the cake with chopped Snickers and peanuts.