Prepare the squash: Peel the butternut squash completely using a sharp vegetable peeler. Cut off both ends, then slice in half lengthwise and scoop out the seeds with a spoon.
Cut into cubes: Slice the peeled squash into even 1-inch cubes. Try to keep the size consistent for even cooking.
Season the squash: Place cubed squash in a large bowl. Add olive oil, salt, pepper, and garlic powder. Add any additional seasonings of your choice (maple syrup for sweet or smoked paprika for savory). Toss thoroughly to coat all pieces evenly.
Preheat the air fryer: Set your air fryer to 380°F (193°C) and allow it to preheat for 2-3 minutes.
Arrange in air fryer: Add the seasoned squash to the air fryer basket in a single layer with some space between pieces. Don’t overcrowd – cook in batches if necessary for proper air circulation.
Air fry the squash: Cook for 12-15 minutes, shaking the basket or stirring the squash halfway through cooking time. The squash is done when the edges are caramelized and crispy, and the centers are fork-tender.
Check for doneness: Pierce a larger piece with a fork to ensure it’s cooked through. If needed, cook for additional 2-3 minute increments until perfect tenderness is achieved.
Serve immediately: Transfer to a serving dish and garnish with additional fresh herbs if desired. For the sweet version, a light drizzle of additional maple syrup works beautifully.