Wash and dry the lettuce and tomatoes, ensuring they're crisp and moisture-free. Pat dry tomato slices to prevent sogginess.

Butter both sides of each thick-cut bread slice. Heat a skillet over medium heat and toast the bread until golden brown, about 3-4 minutes per side.

Cook the bacon in the same skillet over medium heat until golden and crispy, around 5-7 minutes. Reserve some bacon fat if desired.

Spread a layer of mayonnaise on one slice of toasted bread, then add lettuce, tomato, bacon, turkey, and cheese. Top with another mayonnaise-spread slice of bread.

Layer again with lettuce, tomato, bacon, turkey, and cheese atop the second slice, then cap with the final slice of toasted bread, mayo side down. Press gently to hold together.

Cut the sandwich into quarters or halves and serve immediately, enjoying the satisfying crunch!