- Sieve the whole wheat flour and mix well with baking soda and baking powder. Also preheat the oven to 180 degrees for 15 minutes. Take butter in a pan and melt it. Once the butter is melted, switch off the flame. Now add sweetened condensed milk. Mix well with a whisk. Then add warm milk. Give a quick stir. Then add sugar, followed by vanilla essence. Mix everything together with a whisker. Now add the sieved whole wheat flour mixture to the wet ingredients. Gently fold everything well for 10-15 seconds. Don't over mix. Grease a cake pan with butter. Pour the mixture to the cake tin and gently tape it. Bake in the preheated oven at 180 deg C for 25-30 minutes at 180°. Allow to cool in tray for 5 minutes once done. Once the cake is warm, cut into pieces and serve!