Sweet & Rich:
* Creamy: This evokes the richness of the mascarpone cheese.
* Cacao: Highlights the chocolate flavor.
* Coffee: Emphasizes the coffee aroma.
* Boozy: If the tiramisu has a distinct liquor scent, like Marsala wine.
Earthy & Warm:
* Nutty: Captures the essence of the ladyfingers.
* Spice: If cinnamon or other spices are used.
* Warm: For the overall comforting feel.
* Sweet & Savory: Combines the sweet flavors with the subtle earthiness of the coffee.
Ultimately, the best word depends on your personal interpretation of the aroma.
You could also use a phrase to describe the smell:
* The aroma of rich espresso and creamy mascarpone, with a hint of cocoa powder.
* A delicious blend of coffee, chocolate, and sweet, boozy notes.
Let me know if you'd like to explore more specific words or phrases!