Begin by slicing the chicken breasts into thin strips. Season with salt and pepper.
In a large skillet, heat the olive oil over medium heat. Add the chicken strips and cook until they are no longer pink, about 5-7 minutes.
Pour the crushed buffalo sauce over the chicken, stirring to coat evenly. Cook for an additional 2-3 minutes, allowing the chicken to absorb the flavors.
In the same skillet, push the chicken to one side and add sliced onion and bell pepper. Sauté until the vegetables are tender, about 4-5 minutes. Mix them with the chicken once cooked through.
Preheat the oven to 350°F (175°C).
Slice the hoagie rolls lengthwise but not all the way through to create a pocket. Place them on a baking sheet.
Spoon the buffalo chicken and vegetable mixture into each hoagie roll, then place a slice of provolone cheese on top of the filling.
Bake in the preheated oven for about 5-7 minutes, or until the cheese is melty and bubbly.
If desired, sprinkle with blue cheese crumbles and garnish with fresh parsley before serving.
Notes
Add blue cheese crumbles for extra flavor if desired.