Preheat your oven to 350°F (175°C). Grease a 6 or 7 inch springform pan. You can line the bottom with parchment paper.
Add all ingredients (cottage cheese, eggs, sweetener, cornstarch, vanilla extract, lemon zest, and salt) to a powerful blender or food processor. Blend until completely smooth and creamy.
Pour the blended mixture into the prepared oven pan. Bake for 25 minutes or until the sides are lightly golden and the center is just slightly jiggly.
Turn off the oven and let the cheesecake cool in the oven with the door slightly open for about 1 hour. This should prevent the cheesecake from cracking.
Remove the cheesecake from the oven and let it cool completely at room temperature. Transfer to the fridge to chill for at least 4 hours, ideally overnight,
Notes
Don't worry if the center looks uncooked and jiggly it will set after cooling.
Make sure the blended mixture is completely smooth because any lumps will affect the texture.
You can strain the batter using a sieve to avoid any lumps or clumps.
Don't overbake the cheesecake as it will lead to a dry and cracked cheesecake. A slight jiggle in the center is ideal.
The slow cooling process in the oven is an optional step to prevent cracking.
Resist the urge to dive into the cheese just out of the oven or even after it's cooled at room temperature. Chilling the cheesecake for at least hours allows it to set properly and develop its full flavor.