In a mixing bowl, blend together the mascarpone cheese, espresso, powdered sugar, and vanilla extract. Mix until smooth and creamy, about 2-3 minutes.

Cover the bowl with plastic wrap and refrigerate the mixture for at least 1 hour.

Once chilled, use a small cookie scoop or your hands to form the mixture into bite-sized balls. Place them on a parchment-lined tray.

In a microwave-safe bowl, melt the dark chocolate in 30-second intervals, stirring in between, until completely smooth.

Dip each truffle into the melted chocolate, ensuring they're fully coated, then return them to the tray.

While the chocolate is still soft, lightly dust each truffle with cocoa powder.

Return the tray to the refrigerator and let the truffles set for at least 30 minutes.

Once set, serve the Tiramisu Truffles on a lovely platter and enjoy.