In a large bowl, mix together Chicken, onions, peppers, oil, salt, turmeric, garam masala and cayenne.
Place the chicken and vegetables in the air fryer basket.
Set the air fryer for 360F for 15 minutes. Stir and toss half way through the cooking time.
Meanwhile, make the sauce: In a small microwave safe bowl, combine tomato sauce, water, garam masala, salt, and cayenne.
Microwave for 1 minute. Remove and stir. Microwave for another minute. Set aside.
Once the chicken is cooked, remove and place chicken and vegetables in a large bowl. Pour the prepared sauce over them, and toss to cover the chicken and vegetables evenly with the sauce. Serve with rice, naan, or a side salad.
You can also cook this dish stovetop. You would stirfry the chicken, onion, and bell pepper until they were mostly cooked, and then add the sauce along with a little extra water. Then, you'd cover the pan and let it simmer until the sauce had thickened, and the chicken and veggies were cooked through. Leave a little bite in the veggies and you're all set.