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 from the skillet and set aside.
In the same skillet, add the sliced onion and bell pepper. Sauté for about 5-6 minutes, or until the vegetables are tender.
Return the buffalo chicken to the skillet with the vegetables and mix well to combine.
Preheat your oven to 350°F. Slice the hoagie rolls lengthwise and place them on a baking sheet.
Divide the buffalo chicken mixture evenly among the hoagie rolls. Top each with provolone cheese slices.
Bake in the preheated oven for about 5-7 minutes, or until the cheese is melted and bubbly.
Remove from the oven and garnish with fresh parsley if desired. Serve hot.