Preheat oven to 300° F.
Make a double boiler to heat the work bowl from your mixer by filling a saucepan with a couple inches of water and bringing it to a boil on stovetop. Once boiling, lower heat to simmer.
Put egg whites into work bowl from your stand mixer and whisk in the sugar using a hand whisk. Hold this bowl over the saucepan of water and whisk until sugar dissolves and the mixture is quite warm, about 5 minutes. Remove from heat, dry outside of bowl, place in stand mixer with whisk attachment and whisk on high for 15 minutes until mixture is cool and billowy.
Line a baking sheet pan with a Silpat liner or parchment. Drop the meringue in 10 mounds on pan and optionally sprinkle with sliced almonds or dried lavender or rose. Place in oven and turn heat off. They'll be perfectly baked by morning.