01 - Preheat oven to 400°F.
02 - Heat 1 tbsp olive oil in a large skillet over medium heat. Add sliced onions 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 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 oven for 3–4 minutes until just golden.
06 - Divide chicken and vegetable mixture evenly among toasted rolls. Top each with 2 slices provolone cheese.
07 - Return sandwiches to oven for 3–4 minutes, until cheese is melted and bubbly. Serve immediately while hot.