Preheat your oven to 425°F (220°C) and line two baking sheets with parchment paper.
Carefully cut the butternut squash in half lengthwise and scoop out the seeds.
Using a mandoline slicer or a sharp knife, thinly slice the squash into even discs (about 1/8 inch thick).
In a large mixing bowl, combine the olive oil, garlic powder, smoked paprika, sea salt, black pepper, and optional cayenne pepper. Mix well.
Add the squash slices to the bowl and gently toss until all the slices are evenly coated with the oil and seasoning mixture.
Arrange the squash slices in a single layer on the prepared baking sheets, making sure they do not overlap.
Roast in the preheated oven for about 20-25 minutes, flipping the chips halfway through, until they are golden brown and crispy. Keep an eye on them to prevent burning, as cooking times may vary based on your oven.
Once done, remove from the oven and let them cool for a few minutes. They will continue to crisp up as they cool.
For added flavor, sprinkle fresh herbs over the chips before serving.
Notes
Serve in a rustic bowl or on a wooden platter, garnished with fresh herbs for added flavor.