Place the halved Brussels sprouts in a large bowl, then evenly coat with olive oil, balsamic vinegar, salt and pepper. Toss to ensure an even coat. Add pancetta and toss again to combine.
Load the mixture into the rotisserie basket and attach the lid.
Place the drip pan in the bottom of the cooking chamber. Using the display panel, select Air Fry, then adjust the temperature to 350°F / 177°C and the time to 20 minutes. Press Start.
When the display indicates “Add Food” use the rotisserie fetch tool to lift the basket into the cooking chamber, using the red rotisserie release lever to secure the basket. Close the door and select Rotate.
Continue to cook until the Brussels sprouts are golden brown and the pancetta is fully cooked.