Season your chicken slices with salt, pepper, garlic powder, and Italian seasoning. Leave them to rest for a few minutes while you prep the veggies.
Heat 1 tablespoon of oil in a large skillet over medium heat. Add the sliced bell peppers and onion, stirring occasionally for about 6-8 minutes. The veggies should soften and develop slight caramelization. Remove them from the skillet and set aside.
Add the remaining oil to the same skillet and increase the heat slightly. Cook the chicken for about 4-5 minutes on each side until golden brown and fully cooked.
Once the chicken is cooked, lower the heat and return the veggies to the skillet. Stir well to combine the flavors. Separate the mixture into two portions within the skillet.
Place two slices of provolone on each portion of the chicken and veggie mixture. Cover the skillet with a lid or foil for 1-2 minutes to melt the cheese.
Lightly toast your hoagie rolls for added texture. Scoop the cheesy chicken and veggie mixture into the rolls, ensuring each bite is packed with flavor.