Gather all your ingredients, ensuring your apples are well-washed, peeled, and diced into small pieces.
In a medium bowl, combine the diced apples with half of the caramel sauce and ground cinnamon. Mix until the apples are well-coated.
In a rectangular dish, place a single layer of eclair shells. You can break them to fit if necessary.
Spread a layer of the apple and caramel mixture over the eclair shells.
Spread a generous layer of whipped topping over the apple filling, smoothing it out evenly.
Repeat the layering process until you run out of ingredients. The top layer should be the whipped topping.
Cover the dessert with plastic wrap and refrigerate for at least 4 hours, or overnight for best results.
Before serving, drizzle the remaining caramel sauce over the top and if desired, sprinkle with additional cinnamon.
Slice into squares and serve chilled or at room temperature.