Wash the acorn squash thoroughly under running water.

With a sharp knife, carefully cut the acorn squash in half, lengthwise from top of stem to the bottom.

Use a dinner spoon to scoop out and discard all seeds and fibrous bits.

Lightly brush the outsides of the cut squash with 2 tsp of vegetable oil.

Place the two halves of the acorn squash, cut side down, into the air fryer basket.

Air fry at 325 degrees F for 20 minutes.

Remove the squash, butter the insides with 1 tbsp butter, and sprinkle lightly with 1/2 tsp salt.

Place the squash halves, cut side up, back into the air fryer basket and air fry for an additional 5 minutes.