I got this recipe from http://frenchcountrychallenge.typepad.com/blog/
1 x 125g pot of Yoghurt
2 pots sugar
3 pots flour
1 packet levure chimique (1 tsp baking soda and 1 tsp baking powder should work, if you try this let me know how it worked)
1 pot sunflower oil
half pot chopped hazelnuts (optional)
Preheat oven to 180°C (350°F).
Empty one pot of plain yoghurt into a mixing bowl, then rinse and dry the plastic pot.
Add 2 pots full of sugar and 3 eggs and beat together with a fork.
Add 3 pots of flour and the packet of levure, then mix again
Finally add 1/2-1 pot of sunflower oil and stir again. Remove the core from 2 large or 3 smaller apples (if you have one of those implements, great, if not, I chopped in fourths, cut out the core then chopped further), then chop into small pieces. Don't worry about removing the peel. Mix your apple in with the hazelnuts
put your mixture in a buttered cake tin.
Bake in the oven for 40 minutes. Let cool for 15 minutes then remove to a wire rack to finish cooling. Serve warm or cold.