Add gelatin and water to a microwave-safe cup, mix, and let bloom for 2-3 minutes. Then microwave for 15-20 seconds and stir so it's warm, but not boiling.
Add cottage cheese, vanilla extract, lemon extract, lemon juice, lemon zest, sweetener, and gelatin mixture into a blender and blend until smooth (~2 min).
Pour mixture into a mixing bowl and let set in the fridge until you have a solid texture, at least 2 hours.
If desired, pipe mousse into bowls, mason jars, or hollowed-out lemons. Garnish with fresh mint and enjoy!