01 - Preheat the oven to 400°F for toasting rolls and melting cheese.
02 - Heat 1 tbsp olive oil in a large skillet over medium heat. Add sliced onion and bell peppers. Sauté for 8–10 minutes, stirring occasionally, until softened and lightly caramelized. Remove from skillet and set aside.
03 - Add remaining 1 tbsp olive oil to the same skillet. Add sliced chicken, salt, pepper, garlic powder, and paprika. Cook for 6–8 minutes, stirring occasionally, until chicken is cooked through and lightly browned.
04 - Return the sautéed vegetables to the skillet with the chicken. Stir to combine and heat through for 2 minutes.
05 - Slice hoagie rolls lengthwise, leaving one edge intact. Lightly butter the insides of each roll. Place rolls on a baking sheet, cut side up, and toast in the oven for 3–4 minutes until just golden.
06 - Divide the chicken and vegetable mixture evenly among the toasted rolls. Top each with 2 slices of provolone cheese.
07 - Return sandwiches to the oven for 3–4 minutes, or until cheese is melted and bubbly. Serve immediately while hot.