Follow these simple steps to create delicious Chocolate Tiramisu:

1. Prepare Coffee Mixture: In a shallow bowl, combine the cooled brewed coffee and coffee liqueur. Set aside.

2. Whip Egg Yolks: In a large mixing bowl, whisk together the egg yolks and granulated sugar until the mixture is pale and creamy.

3. Add Mascarpone: Gently fold in the mascarpone cheese until smooth.

4. Whip Egg Whites: In another bowl, whip the egg whites until stiff peaks form. Carefully fold the whipped egg whites into the mascarpone mixture.

5. Whip Cream: In a separate bowl, whip the heavy cream until it forms soft peaks. Gently fold this into the mascarpone mixture until combined.

6. Layer Cookies: Dip the sponge cake or ladyfinger cookies quickly into the coffee mixture, making sure not to soak them. Layer them in a dish or individual cups.

7. Add Cream Layer: Spread a layer of the mascarpone mixture over the cookies, spreading evenly.

8. Repeat Layers: Repeat the layers until all ingredients are used, finishing with a mascarpone layer on top.

9. Chill: Cover the dessert with plastic wrap and chill in the refrigerator for at least 4 hours, or overnight for best flavor.

10. Serve and Garnish: Before serving, dust the top with cocoa powder and sprinkle with chocolate shavings.

With these straightforward steps, you can create a luxurious Chocolate Tiramisu that will impress everyone!