In a large skillet over medium heat, add and melt the butter.
Once the butter is melted, add in the pepper and onion. Stir until the peppers are tender and the onions are translucent and caramelized.
Remove the peppers and onions. Set aside.
Add the cooked chicken to the same pan, turn the heat up to high.
Add in the Worcestershire sauce and stir coating the chicken in the sauce.
Once there is no liquid left in the pan, add the peppers and onions back into the pan. Stir to combine.
Sprinkle the garlic powder, salt and pepper into the pan.Toss to coat.
Turn the heat off and break your slices of cheese up on top of the chicken mixture.
Cover with a lid and let it sit while prepping the rolls or buns.
Butter the bread of choice and then broil until golden brown.
Check on the chicken- once the cheese is melted, use tongs to twist and distribute the melted cheese among the chicken.
Arrange the sandwich by spreading mayonnaise onto the bun and then topping with the chicken, veggie and cheese mixture.
Enjoy!