01 - Toast all 6 slices of sandwich bread in a toaster until golden brown and lightly crisped.
02 - Spread approximately 2 teaspoons of mayonnaise evenly over one side of each toasted bread slice.
03 - Place 2 toast slices mayo-side up on a clean work surface. Layer each with half of the turkey or chicken breast, 1 slice of ham if using, 2 strips of bacon, sliced tomato, and a lettuce leaf. Season lightly with salt and pepper.
04 - Place a second toasted bread slice mayo-side up on top of each assembled first layer. Repeat the meat and vegetable layering with the remaining turkey or chicken, ham, bacon, tomato slices, and lettuce. Season again with salt and pepper.
05 - Finish each triple-decker sandwich with the third toasted bread slice, mayo-side down. Insert 2 toothpicks into each sandwich to hold the layers together, then cut diagonally into quarters to create classic wedge-shaped sections.
06 - Plate the sandwich quarters immediately and serve alongside potato chips or a fresh side salad if desired.