Preheat your oven to 325°F (160°C) and lightly grease a small cake pan or line with parchment.
In a mixing bowl, combine Greek yogurt, eggs, cream cheese, sweetener, protein powder, milk, vanilla, and cornstarch.
Whisk until smooth and creamy.
Pour the mixture into the prepared pan and tap gently to remove air bubbles.
Bake for 35-40 minutes or until set but still slightly jiggly in the center.
Turn off the oven and let the cheesecake cool inside with the door slightly open for 1 hour.
Refrigerate for at least 4 hours before serving.
Top with berries or syrup if desired and enjoy!