01 -
Preheat oven to 350°F (175°C) or as noted on the cake mix packaging. Lightly grease a 9×13-inch baking pan.
02 -
Mix cake batter according to package instructions, incorporating the specified eggs, oil, and water. Stir in pumpkin puree until fully integrated for a smooth consistency.
03 -
Transfer batter to the prepared pan and bake for 28 to 33 minutes, or until a toothpick inserted into the center emerges clean.
04 -
Allow cake to cool completely in the pan set upon a wire rack.
05 -
Using a fork or skewer, pierce holes all over the cooled cake approximately 1 inch apart. Pour sweetened condensed milk evenly over the surface, ensuring it sinks into each hole.
06 -
Spread thawed whipped topping evenly over the cake. Drizzle generously with caramel sundae sauce, then sprinkle Heath candy bits or crushed toffee evenly on top. Refrigerate at least 2 hours prior to serving cold.