Preheat your oven to 180 C / 350 F. Butter a 7 or 8 inch round pan and dust well with flour. Line the bottom with parchment (optional).

In a saucepan, double boiler ( bowl placed over a sauce pan containing little simmering water) or in the microwave, melt the butter and chopped white chocolate, at low heat, until smooth. Let cool.

Whisk the flour , salt and baking powder together. Keep aside.

To the butter and white chocolate mixture, stir in the sugar, mix until combined.

Beat in one egg at a time and then whisk in the vanilla extract.

Whisk in the flour mixture until just combined.

Pour the batter into prepared pan.

If using , spread the slices of fruit on top.

Bake for 28 - 32 minutes, until a toothpick inserted in the centre comes out clean.

Let cake cool in pan for 10 minutes.

Unmould and cool completely on a wire rack .