Preheat oven to 350 degrees. Lightly grease a 9x13-baking dish. Combine the cake mix, vanilla pudding mix, pumpkin, water, oil, eggs, and pie spice in a large mixing bowl; pour into the prepared dish. Bake in the preheated oven for 45 to 50 minutes. Allow cooling to room temperature on a wire rack. Cut the cake into 1-inch cubes. Whisk together the milk and cheesecake pudding mix. Allow setting, about 2 minutes. Fold the whipped topping into the pudding mixture. Layer 1/3 of the cake cubes into the bottom of a large bowl; top with 1/3 of the cream mixture and sprinkle with 1/3 of the pecans and toffee bit. Repeat layering until all ingredients are uses. Refrigerate 1 hour before serving.
Ready in 3 hours 10 min