Preheat the oven to 180 °C (356 °F).
Peel the butternut squash using a peeler or a sharp knife. Cut it in half lengthwise, then remove the seeds with a spoon.
Place the squash halves on a cutting board, flesh side up. Position two chopsticks on each side to guide your slicing.
Cut thin slices into the butternut, without going all the way through. The chopsticks will prevent the knife from cutting completely.
Arrange the squash halves on a baking sheet lined with parchment paper or in a large, lightly oiled dish.
In a bowl, mix the aromatic herbs with olive oil, salt, pepper, and a pinch of Espelette pepper.
Brush the squash generously with the mixture, making sure it seeps between the slices.
Bake for 45 minutes to 1 hour, until the flesh is tender. Check by piercing with a skewer, it should slide in easily.
If the herbs begin to brown too quickly, cover the dish with parchment paper.
Once baked, transfer the squash to a serving dish, drizzle with a little olive oil, and sprinkle with freshly chopped parsley. Serve immediately.