In a large mixing bowl, combine egg whites and cream of tartar. Beat at high speed with a mixer until soft peaks form. Gradually add sugars and salt, beating until mixture is thick and creamy, approximately 5 minutes.
Transfer egg-white mixture to a pastry bag fitted with a large star tip (Ateco #848). Using an upright motion, pipe egg-white mixture onto prepared baking sheets, pulling up tip to produce a drop shape.
Garnish with sparkling sugar, if desired.
Bake for 1 hour. Turn oven off, but leave meringues in oven for 6 to 8 hours to continue drying.
Store in an airtight container with waxed paper between layers.
Notes
Kitchen Tip: Since humidity will affect meringues, bake these Fairy Kisses when the air is dry.
Recipe by TeaTime Magazine at https://teatimemagazine.com/fairy-kisses-recipe/