In a large skillet, heat the olive oil over medium heat. Add the diced chicken and season with garlic powder, onion powder, smoked paprika, salt, and black pepper. Cook for about 5-7 minutes, or until the chicken is cooked through and no longer pink in the center.
Stir in the buffalo sauce and cook for an additional 2-3 minutes, allowing the chicken to absorb the flavors. Remove the chicken mixture from the skillet and set aside.
In the same skillet, add the sliced onion and green bell pepper. Sauté for 5-6 minutes, or until the vegetables are tender and slightly caramelized.
Preheat your oven broiler. Split the hoagie rolls and place them on a baking sheet. Layer the chicken mixture evenly on each roll, followed by the sautéed onions and peppers.
Top each sandwich with slices of provolone cheese. Place the baking sheet under the broiler for 2-3 minutes, or until the cheese is melted and bubbly.
Remove from the oven, garnish with chopped parsley, and serve immediately.