Preheat oven to 400°F (200°C). Line a muffin tin with parchment liners.
In a large bowl, mix cream cheese and Greek yogurt until smooth.
Add eggs, sweetener, cornstarch, vanilla, and salt. Beat until fully combined and creamy.
Divide mixture evenly among parchment-lined muffin cups.
Bake for 22–25 minutes, until tops are golden brown with slight cracks.
Cool completely before serving. For best flavor, refrigerate for a few hours.