Begin by brewing your cold brew coffee, allowing it to steep in the fridge for 12 to 24 hours. Once brewed, pour the cold brew into a tall glass, adding coffee liqueur and vanilla extract if desired. Stir gently to combine.

In a medium-sized mixing bowl, combine heavy cream, mascarpone cheese, sweetened condensed milk, and vanilla extract. Use an electric mixer on medium speed, whisking until thickened into a foam that holds soft peaks, about 3 to 5 minutes.

Gently spoon or pour the tiramisu foam over the cold brew mixture, allowing it to float elegantly on top, creating a stunning visual layer.

Lightly dust the top of the tiramisu foam with cocoa powder using a fine mesh sieve. Optionally, garnish with chocolate shavings for extra elegance.