Preheat the oven to 160C (320F) fan-forced. Grease and line two small round cake tins.
Beat the butter and sugar with an electric mixer until light and fluffy. Beat in the egg yolks, one at a time. Stir in the sifted flour and soda in two batches then stir through the yoghurt and most of the raspberries.
Beat the egg whites in a small bowl with an electric mixer until soft peaks form. Fold the egg whites through the batter in two batches then spread the mixture into the tins.
Top with the rest of the raspberries.
Bake the cakes about 35 minutes or until a cake tester comes out clean.
Turn the cakes onto a wire rack to cool.
Enjoy!
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