Pre-heat oven to 200ºF and line a baking sheet with parchment paper.
In a clean bowl of a heavy-duty stand mixer add egg whites, maple syrup, vanilla extract and salt. (see note)
With a clean whisk attachment, beat on low speed until the mixture is foamy and then increase speed to medium-high until stiff peaks form, about 3 minutes.
To form the meringue cookies you can simply scoop 1 heaping tablespoon sized dollop on to the parchment paper, or use a piping bag with a star attachment to pipe about 24 cookies.
Bake at 200ºF for 2 hours. Do not open the oven. When finished baking, shut off oven and leave inside for another 2 hours or so.
Once finished cooling in the oven, the meringues are ready to eat. If not eating right away you must store in an air tight container immediately or they will go soft. Store in an airtight container for up to two weeks.