1Grease and line the bottom and side of a 9-inch round cake pan with parchment paper.
2To make the apple and berry topping, slice the apples into ½-inch-thick wedges and place in a bowl. Sprinkle over half the granulated sugar and stir gently to coat. Arrange the apples and sugar over the base of the prepared pan slightly overlapping.
3Put the blueberries in a bowl, add the remaining sugar and stir to coat. Spoon the berries and sugar over the apples.
4Insert the wire rack into the middle shelf position. Preheat the oven. Set the oven BAKE/350°F/CONVECTION/55 minutes.
5To make the cake, put the butter, sugar and vanilla in the bowl of a stand mixer with the paddle attachment. Beat on medium speed until pale and creamy, scraping down the side every minute. Add the eggs one at a time, beating well after each addition.
6Turn the mixer to low speed, add one-third of the flour, and then one-third of the milk and mix until just combined. Continue alternating the flour and milk until it is all incorporated.
7Spoon the cake batter over the apple and berry mixture. Level the top with a spatula.
8Once preheated, put the cake in the oven and bake for 55 minutes until a skewer inserted into the center of the cake comes out clean.
9Let the cake cool in the pan for 10 minutes, before turning onto a serving plate.
10Top with blueberries and raspberries. Dust with powdered sugar and serve warm with cream.