Season the chicken breasts with avocado oil, salt, black pepper, smoked paprika, and granulated onion.
Heat a skillet over medium heat and sear the seasoned chicken for 12 to 16 minutes, flipping halfway through, until fully cooked. Set aside to rest before slicing thinly.
In the same skillet, add a bit more avocado oil and sauté the sliced bell peppers and onions until charred and caramelized, about 10 minutes. Season with a pinch of salt.
Preheat your broiler and prepare a baking sheet. On one side of each hoagie roll, layer the sliced chicken, sautéed peppers, onions, and top with provolone cheese.
Broil for 2 to 3 minutes until the cheese melts and bubbles.
Place the top half of the hoagie roll on the sandwich and serve immediately.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in a skillet to maintain crispiness.