Preheat the oven to 180℃ / 350℉.
Pour the frozen mixed berries into a ceramic dish. I used a small rectangular dish.
500 g pack of frozen mixed berries
Cream the butter and sugar together, then add the eggs one by one, then fold in the flour.
110 g butter or margarine, 110 g caster sugar (superfine sugar), 2 eggs, 110 g self-raising flour
Finally, stir in the vanilla extract and baking powder and mix gently.
1 tsp vanilla extract, 1 tsp baking powder
Pour the cake batter on top of the mixed berries and spread around with a spoon.
Put it in the oven and bake for approx 40 to 45 minutes, or until the cake is golden brown and a skewer inserted in the middle comes out clean.
Leave to cool and serve either warm or cold. Sprinkle with icing sugar before serving if desired.
a sprinkle of icing sugar