Creating the Oatmeal Creme Pie Tiramisu is relatively straightforward. Follow these easy steps:

1. Prepare the Oatmeal Cookies: If homemade, bake your favorite oatmeal cookie recipe and allow them to cool completely. Crumble into coarse crumbs.

2. Make the Coffee Mixture: In a bowl, combine the cooled brewed coffee and coffee liqueur (if using). Set aside.

3. Mix the Mascarpone: In a mixing bowl, combine mascarpone cheese, powdered sugar, and vanilla extract. Whip until smooth and creamy.

4. Whip the Heavy Cream: In another bowl, whip the heavy cream until stiff peaks form. Then, gently fold this into the mascarpone mixture until well combined.

5. Layer the Tiramisu:
– First Layer: Dip oatmeal cookie crumbs quickly into the coffee mixture. Layer half of the soaked crumbs in the bottom of your serving dish or individual glasses.
– First Cream Layer: Spread half of the mascarpone mixture over the cookie layer.
– Second Layer: Repeat the process by dipping the remaining crumbs in coffee and layering them over the cream.
– Second Cream Layer: Spread the rest of the mascarpone mixture on top, smoothing out the surface.

6. Chill the Tiramisu: Cover the dish with plastic wrap and refrigerate for at least 4 hours, allowing the flavors to meld.

7. Finish and Garnish: Before serving, sprinkle with cinnamon and garnish with chocolate shavings if desired.

8. Serve: Scoop out portions into bowls or serve directly from the dish, ensuring each serving captures the beautiful layers.

These steps will aid you in crafting a breathtaking Oatmeal Creme Pie Tiramisu without a hitch.