PREPARE THE CREAM FILLING
In a medium-sized mixing bowl, whisk together the egg yolks and sugar until thickened and lighter in color.
In a separate large mixing bowl, beat the heavy cream and vanilla extract until stiff peaks form.
Gently fold the mascarpone cheese into the egg yolk mixture until smooth and creamy.
Gradually fold in the whipped cream until the mixture is well combined and creamy. Be gentle to maintain the fluffy texture.
PREPARE THE LADYFINGERS
In a shallow dish, mix the cold espresso with the brown sugar until the sugar is dissolved.
Dip each ladyfinger into the espresso mixture for a few seconds, ensuring they are soaked but not soggy.
ASSEMBLE THE TIRAMISU CUPS
In individual serving cups or glasses, place a layer of soaked ladyfingers at the bottom.
Spoon a layer of the cream filling over the ladyfingers, spreading it evenly.
Repeat the layers, alternating between soaked ladyfingers and cream filling until the cups are filled, ending with a layer of cream on top.
CHILL AND SERVE
Cover the tiramisu cups with plastic wrap and refrigerate for at least 4 hours, or overnight, to allow the flavors to meld and the dessert to set.
Before serving, you can dust the tops with cocoa powder or grated chocolate for decoration if desired.
Serve chilled and enjoy your delicious individual tiramisu cups!