In a frying pan, heat the rest of the oil over a medium heat until shimmering. Add half the gnocchi and fry until lightly golden on each side, around 3-4 mins. Transfer them to a tray using a slotted spoon while you cook the second batch. When all the gnocchi are golden, return them all to the pan to warm through before dividing between four plates. Sprinkle over some black pepper, then top with the thyme leaves, toasted walnuts and a drizzle of olive oil, if you like.