Preheat oven to 350°. Lightly grease a 11 x 7 baking pan. Set aside.
In a large mixing bowl, add the dry cake mix, oil, egg and pumpkin pie spice. Mix well to combine.
Fold in the pumpkin purée and cinnamon chips. Pour into greased 11x7 pan.
Bake for 27 to 30 minutes or until an insert a toothpick in the middle of the cake comes out clean.
Remove from oven and place pan on a wire rack to completely cool.
Once completely cooled, use a straw or wooden spoon handle to poke holes throughout the cake.
Pour the condensed milk into the holes and all over the top of the cake. Chill overnight or for at least 4 hours to allow the milk to saturate the cake.
Add the Cool Whip (thawed) and powdered sugar in a medium mixing bowl. With an electric mixer, beat for 1 minute.
Place the whipped topping on top of the cake and spread evenly with a spatula.
Sprinkle the toffee bits, chocolate chips and pecan pieces on top of the cake. Keep refrigerated until ready to serve.
10. Before serving, drizzle caramel sauce on top of each slice.