If necessary, peel and cut the butternut squash into 3/4-inch cubes.

Place the diced butternut squash (about 3 and a half cups) into a large mixing bowl.

Drizzle the olive oil over the squash and toss to coat thoroughly.

In a separate small bowl, mix together the brown sugar, smoked paprika, cayenne pepper, and sea salt. Stir until well combined.

Add the sugar-spice blend to the squash and stir to ensure an even coating.

Transfer the butternut squash into the air fryer basket. Set the air fryer to 400 degrees F and cook for 13-15 minutes, shaking the basket halfway through.

Continue cooking until the squash is tender when pierced with a fork. Serve and enjoy!