Season the chicken breast with salt and pepper.

Cook the bacon in a skillet until crispy, then remove and set aside.

In the same skillet, cook the chicken breast until fully cooked through, about 6-8 minutes per side. Remove and let it rest for a few minutes before slicing.

Toast the bread slices until golden brown.

Spread mayonnaise on one side of each bread slice.

Assemble the sandwich by layering the sliced chicken, bacon, tomato, and lettuce leaves on one bread slice. Top with another bread slice.

Cut the sandwich in half and serve. Enjoy!