Creating Perfect Pumpkin Tiramisu is simple if you follow these detailed steps:

1. Prepare Coffee: Brew a strong cup of coffee and allow it to cool. Set it aside.
2. Mix Mascarpone Filling: In a large bowl, combine the mascarpone cheese, pumpkin puree, powdered sugar, vanilla extract, and pumpkin pie spice. Whip until smooth and well blended.
3. Whip Cream: In a separate bowl, whip the heavy cream until stiff peaks form. This gives the tiramisu a light and airy texture.
4. Combine Ingredients: Gently fold the whipped cream into the mascarpone mixture until combined, ensuring not to deflate the cream.
5. Prepare the Ladyfingers: Quickly dip each ladyfinger into the cooled coffee. Do not soak them; just a quick dip will do to prevent sogginess.
6. Layer the Tiramisu: In a rectangular dish, lay a single layer of dipped ladyfingers at the bottom. Spread half of the mascarpone filling over the ladyfingers.
7. Add Second Layer: Repeat the process with another layer of dipped ladyfingers, followed by the remaining mascarpone filling on top.
8. Chill the Dessert: Cover the dish with plastic wrap and refrigerate for at least 3 hours, or overnight if possible.
9. Dust with Cocoa: Before serving, lightly dust the top with cocoa powder. For an added touch, sprinkle dark chocolate shavings on top.
10. Serve: Slice into squares and serve chilled for the perfect dessert experience.

Following these steps will ensure that your Perfect Pumpkin Tiramisu turns out beautifully, combining rich flavors and a luxurious texture.