Preheat the oven to 180°C and brush the baking tin with some oil and line it with a parchment/baking paper.
In a large bowl sift together whole wheat flour, baking powder, baking soda, salt, cardamom powder and keep it aside.
In another bowl add jaggery, oil, yogurt and whisk it well until the jaggery melts completely.
Next add the dry ingredients to the wet ingredients along with the water and with a spatula fold it together until everything comes together. It will be athick batter.
Now add the raisins and nuts in the batter and give it a gentle mix. Do not over mix
Slowly pour the batter in the baking tin and top it up with some nuts if you wish to.
Bake in the preheated oven for 35-40 minutes.
Check it with a toothpick after 35 minutes if it comes out clan take it out of the oven.
Cool it completely in a cooling rack. Cut it into slices and serve it with some tea or coffee or milk.