Start preheating the oven before we start making the mixture.
Beat the butter and brown sugar until it�s combined well. You can opt for a mixer or using a whisk. Then, start adding the eggs one by one. The method is to mix and add in the egg, and repeat until all of the remaining eggs are poured into the mixture.
Add in the vanilla essence and continue to mix well.
Use a sifter and sieve the flour along with the salt into the mixture before mixing again.
Now, add in the chocolate chips before using a wooden spoon to mix them altogether.
Pour and spread the mixture into the pan. Sprinkle some chocolate chips on top to make it more chocolatey. At this point, you can add in nuts too.
Bake it in the oven on 175�C for 35-40 minutes or until it�s cooked enough. Try the toothpick test to see whether your congo bars is fully baked or not. Then, serve!