chocolate orange cake

I have a taster night in group tomorrow so I've made the following case:

Ingredients

• 4 eggs, separated
• 50g caster sugar
• 5 tbsp artificial sweetener
• 150g self raising flour
• 1 tsp baking powder
• 2 tbsp finely grated orange zest
• Juice of 2 oranges
• 120g Kraft chocolate Philadelphia
• Tin of mandarin oranges (drained of syrup)

Method

1. Preheat the oven to 190°C/170°C Fan/Gas 5. Line a cake tin with non-stick baking parchment, approximately 24cm x 17cm.
2. Place the egg yolks, caster sugar, sweetener, self raising flour, baking powder, orange zest and juice in a bowl and whisk until thick and pale.
3. In a separate bowl, whisk the egg whites until softly peaked then fold them into the egg yolk mixture. Spoon this mixture into the prepared cake tin and cook in the oven for 25-30 minutes or until the cake has risen and is firm to touch. Leave to cool.
4. Warm the chocolate Philadelphia in the microwave for a few seconds, then turn the cake upside down, remove the baking parchment and spread the chocolate Philadelphia over the top.
5. Cut into 24 pieces and place a mandarin orange segment on the top of each square.