Place the mascarpone and powdered sugar in a mixing bowl and beat several minutes until very smooth and creamy, set aside.
Pour the coffee and Kahlua into a shallow bowl. Dip both sides of the lady fingers briefly into the coffee mixture, (use as many lady fingers as you like according to the size of your martini glass).
Place the lady fingers vertically in the martini glass (when they are soft they can be adjusted to fit in the center of the glass).
Spoon the mascarpone mixture in the center of each glass, garnish with the chopped chocolate pieces, and mint leaves. Serve.
Makes 2 servings.
Tiramisu in a Martini Glass Recipe: https://whatscookingamerica.net/Desserts/TiramisuMartiniGlass.htm