Preheat oven to 350°F and grease a small baking dish.
Blend cottage cheese in a food processor until smooth and creamy.
In a bowl, whisk eggs, sweetener, vanilla, lemon zest, and salt until combined.
Stir in the blended cottage cheese and almond flour until smooth.
Pour the mixture into the baking dish and spread evenly.
Bake for about 40 minutes or until edges are set and center is slightly jiggly.
Let it cool, then refrigerate for at least 2 hours before slicing.
Top with fresh berries if desired and serve chilled.