Preheat oven to 170°C (340°F). Use two large tulip muffin liners or three to four smaller muffin paper liners. For best results, place the liners in a muffin pan so they hold their shape.
Beat 2 egg whites with ¼ teaspoon cream of tartar or lemon juice and a Pinch of salt until soft peaks form.
2 egg whites, ¼ teaspoon cream of tartar, Pinch of salt
Gradually add ¼ cup granulated sugar and beat until stiff, glossy peaks form.
¼ cup granulated sugar
Beat in 1 teaspoon vanilla extract briefly.
1 teaspoon vanilla extract
Sift 3 tablespoons cake flour over the egg whites and gently fold it in.
3 tablespoons cake flour
Fill muffin cups almost to the top.
Bake for 15-18 minutes until lightly golden and springy.
Cool completely in the pan. Dust with Powdered sugar before serving if desired.