4 egg whites
2/3 cup heavy cream
1 tablespoon vanilla extract
Preheat oven to 350 degrees F (175 degrees C). Grease a 8x8 inch dish.
In a large bowl, combine egg whites and cream in small bowl. Beat for 2 minutes. Gradually stir in vanilla extract, a little at a time. Pour batter over egg whites until well mixed.
Pour mixture into prepared pan, making sure to coat completely. Bake in preheated oven for 25 to 30 minutes or until a toothpick inserted into center of cake comes out clean. Allow to cool.