If using pre-cut squash fries, dry them off very well then skip to step 4. Wash your butternut squash and cut off the very top (where it was growing off the vine) and separate the long neck of the squash, which is what we'll use for the fries, setting aside the bottom for a different recipe (see notes for how to prep the bottom for butternut squash fries, as well).
Microwave the squash for 2 minutes to make it easier to peel, then skin the squash and slice it lengthwise into 5 to 7 thick pieces, depending on how thick your squash is.
Next slice each slab into butternut squash steak fries, about ⅓" thick, making sure each squash fry is about the same size for even cooking. Dry these cut fries very well for optimal crisping up, and this goes the same for those zig-zag squash fries from Trader Joe's.
Set your air fryer to preheat to 400°F (205°C) for 3-5 minutes, and while it's heating up, gather your oil, salt, starch, and seasonings of choice (I like 1 teapsoon za'atar & 1 teaspoon garlic powder).
Once your butternut french fries are dried, put them in a bowl and drizzle over or spray on your oil, and sprinkle on the salt, garlic powder, starch, and za'atar (if using), and toss until well-coated.
Pour the seasoned butternut squash fries in the air fryer and arrange them in as thin a layer as possible (don't let them overlap; cook in 2 batches if needed), and cook them at 400°F (205°C) for 12-15 minutes, shaking the basket of squash fries halfway through your cook time. Less time will yield softer fries, while more time gets you something more like shoestring fries.
When the timer goes off, take out your crispy butternut squash fries and taste one, then add extra salt (if needed) & enjoy with your favorite dipping sauce! I recommend chimmichurri, tahini maple, or a pesto aioli.