Soften the cream cheese and stevia (or sugar substitute) until smooth.
Add eggs one at a time, mixing well after each addition.
Add whipping cream and mugwort powder, and mix thoroughly.
Strain the batter to make it smooth.
Pour the batter into a pan lined with parchment paper.
Bake in a preheated oven at 180°C for 35 minutes.
Let it cool completely, then refrigerate before serving.