Prepare Chicken: Cut the chicken breasts in half lengthwise to create thin cutlets. Pound them to ensure uniform thickness.

Marinate: Place cutlets in a freezer bag with honey Dijon marinade, seal tightly, and refrigerate for at least 1 hour or freeze immediately.

Cook Marinade: In a saucepan, bring remaining marinade to a boil, then simmer for 5 minutes until thickened.

Grill Chicken: Preheat grill to medium heat. Cook chicken cutlets for approximately 8 minutes, flipping halfway through, until golden brown and cooked through.

Assemble Sandwiches: Layer the grilled cutlet, Swiss cheese, bacon, and drizzle with sauce on pretzel buns; add optional lettuce and tomato.