Prepare an 8x8 square pan or container lined with parchment paper. Sift the matcha powder and add hot, but not boiling water. Froth or whisk the matcha powder until no clumps remain. Dip the ladyfingers into the matcha and line them in the pan.
Add a layer of the earl grey cream and spread it evenly. Add another layer of ladyfingers dipped into the matcha and top with a final layer of earl grey cream. Optional: Leave some extra earl grey cream for piping on top of the tiramisu later. Repeat these steps as needed if you choose a different size container.
Smooth out the top layer of cream and place it into the fridge to chill for at least 4 hours.
While the tiramisu is chilling, whip the heavy cream, sifted matcha powder, and sugar until stiff peaks form. Transfer it to a piping bag with a star-shaped tip (if you want it to resemble mine).
If you chose to leave some extra earl grey cream from the previous steps, continue whipping the cream until stiff if it's runny and transfer it into a piping bag with a round tip.
Once the tiramisu is ready to serve, alternate piping the matcha and earl grey cream on top of the tiramisu. Lightly dust with additional matcha powder.