Blueberry Traybake

A great summer cake, light and full of seasonal fruit. The recipe is a breeze to whip up and also works well with raspberries or other berries. 125g unsalted butter, softened at room temperature 1 cup white sugar 2 eggs 2 cups plain flour 1 teaspoon baking soda 1 teaspoon baking powder 200ml sour cream…