Optional moisture step: If your squash seems especially watery, spread the squash and zucchini over paper towels and sprinkle with the sea salt. Let them sit for 5 minutes, then pat away the moisture that collects on the surface. If the squash does not seem very moist, you can skip this step.
Add the squash, zucchini, herb seasoning, Parmesan, and oil to a bowl. Toss until evenly coated.
Arrange the vegetables in the air fryer basket, leaving some room between the pieces.
Air fry at 400°F for 6–7 minutes per side, or about 12–14 minutes total, until the squash is tender with browned edges.
Serve right away for the best texture.
Notes
Squash options: Use all yellow squash, all zucchini, or a mix of both.
Salt rest: This step is optional, but it can help when your squash has a lot of moisture.
Herb seasoning: I use a salt-free herb blend with garlic, parsley, thyme, and rosemary.
Don’t overcrowd: Give the squash some room in the basket so it can brown instead of steam.
Serve right away: The vegetables will soften and release more moisture as they sit.