Preheat the oven to 250F and line a baking sheet with parchment paper.
Add the aquafaba and cream of tartar to a bowl. Either using a handheld mixer of a stand mixer, beat until the liquid begins to foam, approximately 2 to 3 minutes.
While continuing to mix, gradually add the sugar to the bowl, along with the vanilla. Keep mixing until you achieve stiff peaks with your meringue. Scoop the meringue into a piping bag and pipe into approximately 30 meringue shaped cookies. Alternatively use a tablespoon to scoop out the meringue onto the baking sheet.
Bake until the cookies have set and are slightly browned, approximately 1 and a half hours. Allow them to cool completely before storing in an airtight container for up to one week.