01 - Preheat the oven to 400°F.
02 - Wash and dry the potatoes. Place each potato between two wooden spoons or chopsticks. Slice thinly, making parallel cuts about 1/16 inch apart, stopping before cutting through, so the base remains intact.
03 - Arrange the potatoes on a baking tray lined with parchment paper. Brush all over with olive oil and season with salt and black pepper.
04 - In a bowl, mix the softened butter with orange zest, parsley, thyme, chilli, garlic, smoked paprika, and sea salt until well combined.
05 - Carefully push the herb chilli and orange butter between the potato slices, reserving some for basting.
06 - Roast the potatoes for 40 minutes, then baste again with the remaining butter. Continue roasting for another 20 minutes, or until golden, crispy, and tender inside.
07 - Serve hot, garnished with extra herbs and a sprinkle of orange zest if desired.