Step 1: Prepare the Coffee Mixture

1. In a shallow bowl, combine the cooled espresso or strong coffee with the coffee liqueur (if using) and 1 tablespoon sugar.
2. Stir until the sugar is completely dissolved.
3. Set aside to cool completely.

Step 2: Make the Mascarpone Cream

1. In a large bowl, beat the mascarpone cheese with 1/3 cup sugar until smooth and creamy.
2. In a separate chilled bowl, whip the heavy cream and vanilla extract until stiff peaks form.
3. Gently fold the whipped cream into the mascarpone mixture using a rubber spatula. Be careful not to deflate the cream.

Step 3: Assemble the Individual Tiramisu Desserts

1. Break the ladyfinger cookies into pieces that will fit your serving glasses or cups.
2. Quickly dip each ladyfinger piece into the coffee mixture (about 1-2 seconds on each side) – don’t soak them too long or they’ll fall apart!
3. Place a layer of soaked ladyfingers at the bottom of each serving cup.
4. Add a generous layer of the mascarpone cream mixture (about 2 tablespoons) over the ladyfingers.
5. Add another layer of coffee-dipped ladyfingers.
6. Top with another layer of mascarpone cream.
7. Dust the top with cocoa powder using a small sieve or strainer.

Step 4: Chill and Serve

1. Refrigerate these tiramisu dessert cups for at least 2 hours, or ideally overnight, to allow the flavors to meld together.
2. Just before serving, dust with additional cocoa powder and garnish with chocolate shavings or fresh berries if desired.