Preheat oven to 180°C.

Mix eggs with sugar. Add yogurt, oil and finaly flour and baking powder.

Break chocolate into pieces and add to the mix.

Line a bread tin with greaseproof paper.

Bake for approximately 50 minutes. Watch baking process, put a knife into the cake and if it comes out clean, then it is cooked.

For a all chocolate version, you can add 5 tablespoons of black chocolate powder unsweetened.