Found it under secret menu on KFC app and seems like a good deal.
Comes with 2 burgers, 6 nuggets and sauce, 2 regular chips, 2 regular drinks and 2 chocolate mousse.
For anyone wondering
"To discover all their secret dishes, you simply need to download the KFC app, swipe down on the main menu and hold for 11 seconds."
Does anyone know how to get that "tis the seasoning" jumper on the ads?