4 large egg whites
1 cup white sugar
pinch of salt
1 teaspoon vanilla extract

Put egg whites, sugar and salt in a glass or metal bowl over a simmering pot of water.  Whisk constantly until sugar dissolves and mixture is hot to the touch. Add vanilla.

Pour mixture into large bowl or mixer bowl and beat for 3 minutes until fluffy.  I used the whisk attachment to do this.

For this picture I put the icing in a sandwich bag, snipped the end and piped it on to make swirly tops.

This is great on cupcakes or as icing for a cake.  Filling for cupcakes.  Eating with a spoon.  You could possibly make rice krispie treats with it.