Pre-heart your oven to 180°C/350°F.
In a bowl, beat the egg and sugar together until it has Iightened somewhat.
Add the yoghurt, oil and bananas. Mix to combine.
Sift into the wet ingredients the flour, baking powder and baking soda. Add the protein powder. Gently fold the dry ingredients in.
Mix in the white chocolate and about 60g of the raspberries.
Pour the mixture in a greased or baking paper lined load tin. Sprinkle the remainder of the berries on top.
Bake at 180°C, conventional, for 45-50 minutes. Or, you know the drill, until a knife comes out clean(ish, I like it a little underbaked and gooey. So does the salmonella probably, so don't listen to me!).