1. First, gather all the required ingredients for Pumpkin Pie Tiramisu, including cream cheese or mascarpone, heavy cream, pumpkin puree, sugars, pumpkin spice seasoning, ladyfingers, cold coffee, and optional toppings like whipped cream, chocolate shavings, or cocoa powder.
2. Begin preparing the cream mixture by combining 1 cup of pumpkin puree with 2 cups of cream cheese or mascarpone in a large mixing bowl. Blend until smooth using a hand mixer.
3. Gradually add ½ cup of granulated sugar, ¼ cup of light brown sugar, and 2 tablespoons of pumpkin spice seasoning to the mixture. Mix until thoroughly combined.
4. Add 1 cup of heavy cream to the mixture, beating it continuously for 3 to 5 minutes until the texture becomes thick and fluffy.
5. Prepare a shallow bowl of 1 cup of cold coffee, optionally adding a splash of Kahlua or another coffee-flavored liqueur for extra depth.
6. Briefly dip each ladyfinger into the coffee mixture. Be quick to avoid overly soggy ladyfingers.
7. Arrange the soaked ladyfingers as the base layer in a 9x13x3-inch deep dish or springform pan.
8. Spread half of the prepared pumpkin cream mixture evenly over the layer of ladyfingers using a spatula.
9. Repeat with another layer of coffee-soaked ladyfingers on top of the cream mixture.
10. Spread the remaining half of the pumpkin cream mixture evenly over the second layer of ladyfingers, ensuring a smooth and consistent top layer.
11. Cover the dish with plastic wrap and refrigerate the assembled tiramisu for at least 6 hours, or preferably overnight, to allow the flavors to meld and the dessert to set.
12. Before serving, garnish the top with whipped topping, chocolate shavings, or a dusting of cocoa powder for added flavor and presentation.
13. Slice and serve your Pumpkin Pie Tiramisu chilled, enjoying the comforting flavors of fall in this creamy, decadent dessert.