Preheat the oven to 225 degrees.

Add the egg whites, cream of tartar and salt to a mixing bowl. Blend until foamy.

Pour the sugar into the mixture a tablespoon at a time, while continuing to mix the entire time.

Beat until stiff peaks form and the mixture is shiny.

Fold in the vanilla.

Pipe the mixture onto a parchment lined baking sheet in the shape of Hershey Kisses.

Bake for 1 hour.

Turn the oven off, and let the cookies sit in the unopened oven for 2 hours.