Marinate the Chicken: In a bowl, mix pickle juice and milk. Add the chicken breasts and let marinate for at least 30 minutes (or up to 4 hours for maximum flavor).
Grill the Chicken: Remove the chicken from the marinade and pat dry. Brush with olive oil and season with salt, black pepper, garlic powder, and smoked paprika. Preheat a grill or grill pan to medium-high heat and cook each chicken fillet for about 4-5 minutes per side until fully cooked (internal temperature of 75°C/165°F).
Toast the Buns: Lightly toast the sandwich buns on a grill or in a pan for extra flavor.
Assemble the Sandwich: Place a grilled chicken fillet on the bottom bun, top with a slice of Colby-Jack cheese, a slice of tomato, lettuce, and turkey bacon (if using). Spread honey mustard sauce on the top bun and place it over the toppings.
Serve & Enjoy: Secure with a toothpick if needed and serve warm with waffle fries or a side salad.