Melt white baking chocolate -  If you are using the white baking chocolate bar, chop them into small pieces. Melt white baking chocolate in a microwave or use a double boiler. If you are using microwave, don't do it for more than 30s at a time. Chocolate can get burnt. Let the melted chocolate cool down.

In a large bowl, beat cream cheese and butter until fluffy.

Beat in cooled melted chocolate and vanilla essence.

Gradually add confectioners' sugar until smooth. I would say, taste and add sugar up to the sweetness you need. I don't like to make this frosting / filling too sweet. I love to retain the tanginess of the cream cheese. This frosting is good enough to fill and frost the top and sides of a 3 layer cake. Enjoy :)