Place them on a baking tray, skin side up, and roast in a preheated oven at 200°C for about 20 minutes. The skin should blister and darken slightly.*They can also be cooked in an air fryer for about 18 minutes at 180°C.
Let the peppers cool slightly before removing the skin, then leave the peppers to cool completely on a plate. They must not be hot when they are blended with the other ingredients.
Blend the peppers, feta, parsley and garlic to a smooth cream. – I use a mini chopper.
Transfer to a bowl and stir in the yoghurt, then season to taste with salt, pepper and chilli flakes, if using.
Serve in a bowl, topped with a little olive oil and, if you like, some parsley and chilli flakes.