Pour heavy cream and cottage cheese into a medium saucepan. Use an immersion blender to remove the curds from the cottage cheese.
Turn heat to medium heat and sprinkle gelatin over cream mixture. Don't stir, so gelatin blooms while the mixture comes to a simmer, about 3-5 minutes.
Once at a simmer, reduce heat to low and continually whisk mixture until gelatin mixture is completely dissolved.
Whisk in the salt, and sweetener and continue to simmer just about 2-3 minutes. Turn off heat and stir in vanilla extract. Taste and adjust sweetener if needed.
Evenly pour panna cotta mixture into dishes and allow to cool 15 minutes. Place in the refrigerator covered with plastic wrap to set for about 2-3 hours of chilling time before serving or overnight.
Store covered in an airtight container in the fridge for up to 3 days.