Pre-heat your oven to 225ºF and line a baking sheet with parchment paper
Bring 2 inches of water to a simmer in a pot. Place a clean stainless steel mixing bowl over the water. It shouldn't touch the water.
Combine your egg whites and sugar and whisk to combine. Occasionally whisk as it's heating to distribute the heat and dissolve the sugar.
Once your egg whites are at 110ºF (or when you don't feel any grains of sugar between your fingers) you're read to whip
Place the bowl on your stand mixer with the whisk attachment. Whisk on med for one minute, add in cream of tartar, salt and flavoring.
Bump up to high and let whip until you reach STIFF peaks.
Now you are ready to pipe your meringue onto the baking sheet in kisses, swirls or pops. The possibilities are endless!
Bake for 60 minutes, then turn off the oven but do not take out the cookies. Let them sit in the oven until they are completely cold. I leave mine in overnight.
Video
Notes
Humidity warning: Do not bake meringue on a humid or rainy day. The sugar attracts moisture and the cookies will not crisp properly.Rub test for dissolved sugar: Rub a small amount of whipped meringue between your fingers before piping. It should feel completely smooth. Grittiness means keep whipping.Do not refrigerate: Refrigerator humidity will soften meringue cookies within hours. Store at room temperature only.Storage: Airtight container at room temperature, up to 2 weeks. Freezer, up to 1 month.Reviving soft meringues: Bake on a parchment-lined sheet at 200º F for 10 minutes and cool in the turned-off oven for 30 minutes.Chocolate variation: Fold in 2 tablespoons of sifted unsweetened cocoa powder along with the vanilla.Piping guide tip: Trace circle outlines on the back of the parchment paper as a size guide. Flip the paper over before using so the pencil marks do not touch the food.