Preheat the air fryer to 150°C / 300°F or the oven to 180°C.
Line a baking pan with parchment paper.
Add cottage cheese, eggs, sugar, heavy cream, cream cheese, and cornstarch to a blender.
Blend until completely smooth and creamy.
Pour the batter into the prepared pan and tap gently to remove air bubbles.
Bake in the air fryer for 40–45 minutes or in the oven for 35–40 minutes.
If the top browns too quickly, cover loosely with foil.
Cool completely, then chill for at least 4 hours before serving.
Serve chilled with berries or powdered sugar.