Marinate the chicken in olive oil, garlic powder, salt, and black pepper for 20 minutes to infuse it with flavor.
While the chicken is marinating, slice the bell pepper and onion.
Coat them lightly with BBQ sauce for that extra tangy kick.
Heat a skillet over medium-high and add olive oil.
Sauté the marinated chicken until it's cooked through, and no longer pink.
Remove and set aside.
In the same skillet, add the bell peppers and onions.
Cook until softened and caramelized for about 5-6 minutes.
Assemble the sandwich by dividing chicken, peppers, and onions onto each hoagie roll.
Top each with a slice of provolone cheese.
Melt cheese by placing in an oven under broil for 2-3 minutes, or until bubbly.