Cut the chicken breast into cubes, season with salt and pepper and fry in the melted herb butter. Then add the diced onions and roast them too. Now add the tablespoon of tomato paste, the chilli powder and the basil.
Place the puff pastry on a baking tray lined with baking paper and distribute the seared meat on the front half and cover with the back half of the puff pastry, like an apple strudel.
The tray is now placed in the oven preheated to 220 ° C (top / bottom heat) for about 20 minutes until the puff pastry is nice and brown.