Grease a nine hole friand tray. You can also use muffin tins.
Slice the vanilla pod in half/lengthways. Use a knife or a teaspoon to scrape the pod to extract the vanilla seeds. Add them to the icing sugar.
In a large bowl, whisk the egg whites until frothy.
Fold in all the remaining ingredients.
Spoon into your prepared tray and push a few blueberries into each cake
Bake for 20 minutes until golden and a skewer comes out clean.
Leave in the tray for 5 minutes, then transfer to wire rack to cool. Dust with icing sugar before serving.
*I didn’t have any ground almonds on hand, but you can make your own if you have almonds on hand. Just put them in a food processor. I had whole almonds so I first had to blanch them for a minute in hot water, then rinse in cool water which helps remove the skins.