Blend the cottage cheese in a small blender or food processor until completely smooth.
In a large bowl, stir together the peanut butter, blended cottage cheese, sweetener, egg, and vanilla until smooth and glossy.
Add the almond flour, baking soda, and salt, and mix until a thick dough forms. Chill the dough for 15 minutes so it is easier to roll.
Preheat the oven to 350°F and line a baking sheet with parchment paper.
Roll the dough into 1 1/2 tbsp balls and place them 2 inches apart. Press each ball down with a fork, then press again in the opposite direction to make the classic crisscross pattern.
Bake for 11 to 13 minutes, until the edges are lightly golden and the tops look set.
Cool on the baking sheet for 15 minutes, then move to a wire rack to cool completely.