Preheat oven to 250 F. Line a baking sheet with parchment.
In a bowl add the aquafaba, salt and cream of tartar. Using an electric mixer beat until soft peaks form.
Gradually add in the sugar one tablespoon at a time beating until glossy stiff peaks form. Add in the vanilla extract and beat until well incorporated.
Pipe into small circles about 1″ in diameter. Bake for about 90-120 minutes or until firm and they are no longer glossy – rotate the pans half way through.
Turn the oven off, leave the door closed and allow to sit in the oven for one more hour to dry completely.