In a bowl, whisk together matcha powder and hot water until smooth.

In a separate bowl, blend mascarpone cheese, sugar, and vanilla extract until creamy.

Gently fold in whipped cream into the mascarpone mixture until fully incorporated.

Quickly dip ladyfinger cookies into the prepared matcha mixture.

In a serving dish, layer half of the dipped ladyfingers at the bottom, followed by half of the mascarpone mixture. Repeat layers.

Cover the dish with plastic wrap and refrigerate for at least 4 hours or overnight.

Dust the top with additional matcha powder just before serving.