Preheat the slow cooker to high and spray with nonstick cooking spray.
In a blender, combine butter, eggs, cream cheese, vanilla extract, coconut flour, cinnamon and stevia. Combine ingredients until smooth, then pour into the slow cooker.
Cook on high for 2 hours, or until a knife inserted into the center comes out clean.
If desired, sprinkle with powdered Swerve, ground cinnamon and serve with sugar free syrup.