Preheat the oven at 350 F or 180 C. Grease and flour an 8 inch round cake pan.

Add oil, yogurt and sugar in a big bowl.

Beat well on medium speed for 3 minutes or by hand 5 minutes.

Add beaten eggs slowly along with sieved flour and beat on slow speed, until well corporates.

Add the apple sauce and vanilla to the cake mix. :- Sometimes, you need only 1/2 the amount of apple sauce.( The mix should not be runny)

:- The mix when dropped from a spoon should drop slowly and not runny. 6)Divide the cake mix into 2 halves.

Take 1/4 cup chocolate chips and heat in a microwave till it just melts.

Cool it and mix with half the cake mix. :- This is the chocolate mix.

Take the remaining 1/4 of chocolate chips and combine with the other cake mix.

Fill the bottom of the pan with alternate layers of chocolate chip and chocolate mix.

Finally, use a knife to swirl in upward and downward motion round the cake mix to give the marble effect.

Put it into the oven and bake for 70 mins.

Check with a knife. If it comes out clean, it is done.

Note:- This recipe uses limited oil. You can substitute 8 egg whites instead of 4 whole eggs. This is a more healthy version.

:- If using plain flour use 1 heaped tsp baking powder to 2 cups of flour and sieve twice.

:- If apple sauce is not available, use 1 cup oil instead of 1/4 cup