Preheat your oven to 350°F (175°C).
Prepare the chocolate cake mix according to package instructions.
Pour the batter into a greased 9x13 inch baking pan.
Bake for 30-35 minutes or until a toothpick comes out clean.
Let the cake cool for 10 minutes.
Poke holes all over the cake using a fork.
Pour sweetened condensed milk over the warm cake.
Drizzle caramel sauce generously over the cake.
Spread whipped topping evenly on the cake.
Sprinkle chocolate chips and toffee bits on top.
Chill in the refrigerator for at least 2 hours before serving.