Grease a round baking cake tin of 9×9 inches diameter with oil and preheat the oven at 180 degrees celcius.
In a bowl take butter which should be at room temperature.
Add sweetened condensed milk to it and beat till it is light and fluffy.
Next seive all purpose flour, baking powder, baking soda, salt and mix everything well.
Next add vinegar, vanilla extract, milk and beat again to form a smooth lump free batter.
Add crushed walnuts and mix well again.
Pour the cake batter in greased tin and tap the sides of the cake tin.
Bake the cake in a preheated oven at 180°C for 35 minutes. Do check the cake after 30 minutes as the temperature vary from oven to oven.
Once done check the cake with a toothpick. If it comes out clean the cake is perfectly baked.
Let the cake cool down completely, cut in slices and enjoy!
