Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a mixing bowl, combine cashew butter, sugar, egg, baking soda, and vanilla extract. Mix until smooth.
Scoop tablespoon-sized balls of dough onto the prepared baking sheet. Flatten slightly with a fork.
Bake for 10-12 minutes, or until edges are golden. Let cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.