01 - Toast all 6 bread slices in a toaster until golden brown and crisp.
02 - Spread mayonnaise evenly over one side of each toasted bread slice.
03 - Place 2 toasted bread slices mayo-side up on a clean work surface. Layer each with half of the turkey or chicken, 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 on top of each assembled layer, mayo-side facing up.
05 - Repeat the layering on each sandwich with the remaining turkey or chicken, ham, bacon, tomato slices, and lettuce. Season again with salt and pepper.
06 - Cap each sandwich with the third toasted bread slice, mayo-side facing down. Insert 2 toothpicks into each sandwich to hold the layers together, then cut diagonally into quarters to create classic wedge-shaped quarters.
07 - Serve immediately while the bread is still warm, accompanied by potato chips or a fresh side salad if desired.