Leave the cream cheese at room temperature until it softens.
Add sugar substitute to the cream cheese and mix with a whisk.
Add the eggs one at a time, mixing well after each addition.
Pour in the heavy cream and mix thoroughly.
Sift in the green tea powder and cake flour, then gently fold into the batter.
Pour the batter into a pan lined with baking paper.
Bake in a preheated oven at 180°C (356°F) for 25–30 minutes.
Cool completely, refrigerate, and enjoy.