How to Make It
Heat a grill pan over medium-high heat. Cut chicken in half horizontally to form 4 cutlets; sprinkle chicken with salt and black pepper. Arrange on pan coated with cooking spray. Cook 2 to 3 minutes on each side or until done. Remove from pan; thinly slice. Combine hot sauce, butter, and red pepper; stir with a whisk. Add chicken to bowl; toss.
Combine buttermilk, mayonnaise, and cheese in a bowl, mashing with a fork. Add lettuce and celery to bowl; toss.
Warm tortillas according to package instructions. Divide chicken mixture evenly among tortillas; top with lettuce mixture.