Preheat your air fryer to 400°F (or set oven to 425°F if air fryer is unavailable).
Slice the chicken breast into strips or bite-sized pieces for even cooking.
In a shallow bowl, whisk the egg white. In another bowl, add the panko bread crumbs and your favorite spices (like garlic powder, paprika, salt, and pepper).
Dip each chicken piece first into the egg white and then coat evenly with the panko bread crumbs.
Lightly spray the coated chicken with olive oil cooking spray to enhance crispiness.
Place the chicken pieces in a single layer in the air fryer basket (or on a baking sheet if using an oven) and cook for about 10-12 minutes, turning halfway, until crispy and cooked through.
Once the chicken is done, transfer it to a mixing bowl and toss with the buffalo sauce until well coated.
Prepare the lettuce leaves by washing and drying them thoroughly. Spoon the crispy buffalo chicken mixture into the center of each leaf.
Serve immediately, enjoying the delightful crunch and spicy kick of the buffalo chicken wrapped in fresh romaine.