Preheat the oven to 180 degrees Celsius and grease the pan with butter.
In a bowl, combine butter and chocolate and melt them in a microwave at 30 second intervals until no lumps of chocolate remain.
To the same mixture, add the condensed milk and whisk again until the mixture becomes thick, creamy, and evenly combined.
Add flour, cocoa powder and milk and whisk again to make a smooth, shiny, brownie batter.
Transfer the batter into your prepared baking dish and spread it evenly using an offset spatula or the back of a spoon. Tap the pan lightly on the counter to remove air bubbles.
Pipe biscoff over the batter and make swirls with it.
Place the pan in the preheated oven and bake for 20–25 minutes.
Recipe by Bake with Shivesh at https://bakewithshivesh.com/eggless-biscoff-brownie-pudding/