Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan.
In a large bowl, mix together the chocolate cake mix, eggs, and water until well combined.
Pour the batter into the prepared pan and bake for 30-35 minutes or until a toothpick comes out clean.
Allow the cake to cool for 10 minutes, then poke holes all over the surface using a wooden spoon handle.
Warm the caramel sauce slightly and pour it over the poke holes evenly.
Mix the peanut butter into the whipped topping and spread it over the cake.
Top with chopped Snickers bars and serve chilled or at room temperature.