Preheat oven at 200 degree and grease and dust the tin.

In a bowl take flour and coco powder and sieve 4 times.

In a mixing bowl,Add yogurt and sugar mix well after add baking powder and baking soda mix well 2 min and keep for 5 min.

After put vanilla essence coffee powder and butter in yogurt mixture, mix gently.

Now mix four in mixture spoon by spoon. Add crush chocolate in better.

Pour the mixture in grease tin.

Put some walnut on the mixture.

Baked in preheat oven at 180 degree for 30 to 35 min.

Take tooth pick test and cool it. Cut into slices and enjoy.