– 1 ¾ cup powdered sugar
– ? cup flour (for lighter, airier texture, use sifted cake flour)
– ½ cup sourdough discard, stirred down
– 12 egg whites, room temperature
– 1 ¾ cup powdered sugar– ? cup flour (for lighter, airier texture, use sifted cake flour)– ½ cup sourdough discard, stirred down– 12 egg whites, room temperature
In a large mixing bowl, mix the wet ingredients. Whisk egg whites, water, vanilla extract, and cream of tartar on low for a minute, then sift in the remaining ¾ cup powdered sugar and whisk.