Heat olive oil in a skillet over medium heat.
Add sliced onions and cook until translucent.
Add green and red bell peppers; sauté until soft.
Season the chicken slices with salt and pepper.
Push the veggies to the side and add chicken to the skillet.
Cook the chicken until browned and cooked through.
Mix the veggies with the chicken in the skillet.
Place the provolone cheese slices on top and cover until melted.
Toast the hoagie rolls in the oven or on a skillet.
Assemble the sandwich by filling the rolls with the chicken and veggie mixture.