Crafting the Juicy Grilled Chicken Club Sandwich is a straightforward process. Follow these steps for perfect results:

1. Prepare the Chicken: Season the chicken breasts with salt and pepper. You can also marinate them in your favorite dressing for added flavor.
2. Cook the Bacon: In a skillet over medium heat, cook the bacon until crispy. Remove and let it drain on paper towels.
3. Grill the Chicken: Heat a grill or grill pan over medium-high heat. Lightly coat with olive oil or cooking spray. Grill the chicken for about 6-8 minutes per side, or until cooked through and juices run clear. Use a meat thermometer to ensure it reaches 165°F (75°C).
4. Toast the Bread: While the chicken cooks, you can toast the bread slices on the grill or in a toaster until golden brown.
5. Mix the Sauce: In a small bowl, combine mayonnaise and Dijon mustard. Adjust to taste and set aside.
6. Assemble the Sandwich: On a slice of toasted bread, spread a layer of the sauce. Add grilled chicken, crispy bacon, romaine lettuce, and tomato slices. Top with another slice of bread, then repeat the layers to build a double-decker sandwich.
7. Slice and Serve: Cut the sandwich in half or quarters for easy eating. You can secure with toothpicks if needed.

These step-by-step instructions will guide you in making the Juicy Grilled Chicken Club Sandwich hassle-free.