Preheat oven to 225 degrees. In a medium bowl, beat egg whites, salt, cream of tartar, and vanilla until soft peaks form. Gradually add sugar (1 tablespoon every five seconds), and continue to beat until meringue is stiff and glossy, about 1 1/2 minutes more. Gently fold in the chocolate chips.
Drop meringue by scant 1/4 cups onto parchment-lined baking sheets. Bake until dry and just golden brown, about 1 to 1 1/2 hours. Let cool on baking sheets.