In a pudding bowl/ glass, pour 1/4 cup chocolate ganache in it. Now place the leftover 5 bowls on a slab and pour 1/4 cup chocolate ganache in each. Keep all the bowls in the freezer. Meanwhile, make the vanilla pudding.
Now, in a saucepan, pour milk followed by 3 tbsp of sugar. Let it come to a boil and then switch off the gas flame. Keep it aside.
In a blender, add egg yolks and 3 tbsp of sugar. Blend it well and then add 1/4 cup of the warm milk prepared. Blend it for 1 minute and then add salt and cornflour. Blend it and finally add the remaining milk. Blend it again till you get a smooth consistency.
Pour the prepared mixture into a saucepan. Stir the mixture continuously for 2-3 minutes on medium flame. Once the mixture has thickened well, switch off the gas flame. Now, add vanilla extract and melted butter to it. Whisk it well and ensure no lumps are formed. It should be smooth and have a thick consistency.
Now, take out the pudding bowls from the freezer and fill all of them with the vanilla pudding. Freeze it for at least 1 hour now.
Your Chocolate Vanilla Pudding is now ready. You can garnish it with some sprinkles or chocolate shavings.