Preheat the Air Fryer to 300 degrees Fahrenheit.
Slice the sausage if preferred and set aside. Slice the bell peppers and dice the onions.
Place the sausage, peppers, and onions into a large sealable plastic bag. Add the olive oil and seasonings to the bag. Seal the bag without removing the excess air, and then toss the bag carefully to coat the sausage and peppers with the oil and seasonings.
Add the sausage, peppers, and onion to the preheated Air Fryer basket. Cook on 300 degrees Fahrenheit for 30 minutes, tossing the sausage and peppers every 5 minutes.
Remove from the Air Fryer and serve immediately.
