Combine onion powder, garlic powder, Italian seasoning, salt, pepper and a pinch of brown sugar.
For the chicken
In a skillet, toast potato rolls with butter and oil over medium heat until golden brown and crispy.
Thinly slice chicken breasts, then drizzle with olive oil. Season generously with Tajín Classico, and the seasoning blend.
Heat a skillet over high heat with neutral oil. Sear the chicken for 5-6 minutes on each side, undisturbed, until a blackened, charred crust forms. Once fully cooked, top with pepper jack cheese slices. Add 1 tablespoon of water to the skillet, cover, and let the steam melt the cheese to a gooey perfection.
To assemble
Take some of the Hellmann’s Chili Lime Mayonnaise and spread it generously on the toasted side of both buns.
On the bottom bun, layer fresh lettuce, seasoned tomato slices, the blackened chicken breast with melted pepper jack cheese, and pickled red onions. On the top bun, add creamy avocado slices.
Put the sandwich together, slice in half. Serve with chips or fries and enjoy!