1. Heat grill to medium high. Pound chicken to create thin cutlets about 1/4-inch thick. Season with garlic salt and pepper and grill until cooked through; about 4 to 6 minutes. Place one cheese slice on top of each cutlet during the last minute of cooking to melt.
2. To make each sandwich, spread one piece of toast with mayonnaise and one piece with a generous layer of pepper jelly. Fill with chicken, bacon and some arugula.