Creating Biscoff Speculoos Tiramisu is a delightful process. Follow these steps to ensure a successful dessert:

1. Prepare Coffee Mixture: In a bowl, mix the brewed coffee with coffee liqueur (if using). Set aside to cool completely.
2. Make the Cream Mixture: In a large mixing bowl, combine mascarpone cheese, heavy whipping cream, powdered sugar, and vanilla extract.
3. Whip the Mixture: Using an electric mixer, beat the mixture on medium speed until it forms stiff peaks. This will create a light and fluffy filling.
4. Dip the Cookies: Quickly dip each Biscoff cookie into the cooled coffee mixture, making sure not to soak them too long.
5. Layer the Cookies: Arrange a layer of dipped cookies at the bottom of your serving dish.
6. Add Cream Layer: Spread half of the mascarpone mixture over the layer of cookies, smoothing it out evenly.
7. Repeat Layering: Add another layer of dipped cookies on top of the mascarpone mixture, followed by the remaining mascarpone filling.
8. Chill: Cover the dish with plastic wrap and refrigerate for at least 4 hours, preferably overnight, to allow the flavors to meld.
9. Dust with Cocoa: Before serving, dust the top with cocoa powder for an elegant finish.
10. Garnish: Optionally, add additional Biscoff cookies on top for decoration.

By following these steps, you’ll create a stunning and delicious Biscoff Speculoos Tiramisu that will impress everyone!