01 - Preheat the oven to 400°F.
02 - Heat 1 tbsp olive oil in a large skillet over medium heat. Add 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 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. Place rolls cut side up on a baking sheet and toast in oven for 3-4 minutes until 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.