Heat oven to 325 degrees F. Coat 2 baking sheets with cooking spray.
Beat 4 large egg whites in bowl until stiff, but not dry, peaks form. Beat in 1 teaspoon vanilla extract and contents of jar. Drop batter by rounded teaspoonsful 1 inch apart onto prepared baking sheet. Bake for 20 to 25 minutes or until lightly browned. Let cookies cool briefly on baking sheets, then transfer to wire racks to cool.