Begin by toasting the slices of whole grain bread until golden brown. This adds a nice crunch to your sandwich.
In a small bowl, mix together the mayonnaise and Dijon mustard. Season with salt and pepper to taste.
Spread a generous layer of the mayo-mustard mixture on one side of four slices of toasted bread.
Layer the turkey breast evenly over the mayo-mustard spread on each of the four slices.
Add a slice of cheddar cheese on top of the turkey, followed by a layer of crispy bacon.
Top with lettuce leaves and tomato slices.
Place the remaining four slices of toasted bread on top, mayo-mustard side down.
Secure each sandwich with toothpicks and cut them in half diagonally for easy handling.
Serve immediately or refrigerate for up to 30 minutes before serving for a chilled option.