1. Heat oven to 180 deg C fan bake. Grease 12 oval-shaped friand or muffin pans. Place sifted icing sugar, sifted rice flour and ground almonds in a bowl. Make a well in the centre and pour in lighly beaten egg whites, vanilla essence and melted butter, then stir briefly to just combine.
2. Divide mixture between prepared pans to two-thirds full. Top each friand with a sprinkling of berries.
3. Bake for 25 minutes until golden brown. Remove from oven and leave to stand in pans for 5 minutes before turning out onto a cooling rack. Serve with yoghurt, if desired.

Tip: Fresh or frozen berries work well in this recipe. Use frozen berries straight from the freezer - there's no need to defrost them first.

Tip: Excess egg whites can be frozen until needed for use in recipes like this one. When measuring egg whites from bulk, 30ml is equivalent to one egg white.