Preheat the oven to 200°F (93°C) and line a baking sheet with parchment paper.
In a clean mixing bowl, beat the egg whites and cream of tartar on medium speed until foamy.
Gradually add the sugar, a tablespoon at a time, while continuing to beat on high speed until stiff, glossy peaks form.
Mix in the vanilla extract until just combined.
Transfer the meringue to a piping bag fitted with a round tip.
Pipe ghost shapes onto the prepared baking sheet.
Place two chocolate chips on each ghost for eyes.
Bake in the preheated oven for 1 hour until dry and crisp.
Turn off the oven and let the meringues cool inside with the door ajar.