Prepare a baking sheet(s) with baker’s parchment.
Preheat oven to 250 degrees
In a small bowl stir together sugar free gelatin powder, salt and Swerve.
In a large mixing bowl, beat egg whites with cream of tartar until foamy and cream of tartar is dissolved.
While mixing, slowly and evenly pour gelatin mixture into egg whites.
Beat the egg / gelatin mixture until it is stiff and glossy and stands in peaks. It will take 3-5 minutes total mixing time.
Add in optional flavoring, if using, and mix in on low till just combined or stir in gently with spatula. Do not over beat the batter or it will deflate.
Transfer batter to piping bag with a jumbo tip. Or dollop by rounded tablespoonful onto prepared cookie sheet.
On the prepared pan, pipe puffs onto parchment paper about 1 inch apart. (Cookies puff up a bit while baking.)
Sprinkle with nonpareils or sugar sprinkles.
Place pan in oven and bake meringues at 250 degrees for 20 minutes. Turn oven off and allow them to sit in oven for 25 minutes. Cookies will not brown.
Remove from oven and allow cookies to cool for about 5 minutes and then transfer to wire rack to dry completely.
Cookies should be puffy and crispy.
Store in an airtight container to retain crispness.