Add the animal-free egg white powder and water to a blender or drink mixer. Blend until completely dissolved, then let sit for about 5 minutes to hydrate.
Transfer to a clean mixing bowl, add the cream of tartar, and whip until soft peaks form. This can take 10–15 minutes.
In a small saucepan, combine the agave syrup, maple syrup, and cinnamon. Heat over medium heat, using a candy thermometer, until the mixture reaches 240°F (115°C).
With your mixer running on medium-low, very slowly pour the hot syrup down the inside of the bowl into the whipped egg whites, avoiding the whisk.
Increase the mixer speed to high and continue whipping until the mixture becomes thick, glossy, and fluffy, about 5–8 minutes.
Transfer to an airtight container and refrigerate. For best quality, enjoy within 3–5 days.
