Mix the salt, onion powder, garlic powder, and pepper together. Add it to the sliced chicken and toss to coat.
In a large skillet add 2 tablespoons of olive oil and heat. Once the oil is hot add the sliced green peppers, red peppers, and onions, saute until they are tender about 15 minutes.
Remove the peppers and onions from the skillet. Add the remaining tablespoon of olive oil. Add the chicken and saute for 5 to 8 minutes or until no longer pink.
Add the peppers and onions back to the skillet and heat until they are heated.
Place the cheese slices on top of the vegetables and chicken. Cover the skillet and heat until the cheese is melted.
Scoop the vegetables, chicken, and melted cheese onto buns. Serve