Heat olive oil in a large skillet over medium heat.
Add sliced onions and bell peppers; sauté for 5-7 minutes until tender.
Season with salt, pepper, and garlic powder.
Push the veggies to one side of the skillet.
Add the sliced chicken to the other side; cook for 5-7 minutes until no longer pink.
Mix the chicken and veggies together in the skillet.
Place provolone cheese over the mixture; cover with a lid to melt.
Split hoagie rolls and lightly toast them.
Spoon the chicken and cheese mixture into each roll.
Serve warm, optionally with hot sauce.