01 - Toast all 12 slices of bread until golden brown. Lightly butter each slice if desired for extra richness.
02 - Spread mayonnaise evenly over one side of each toasted bread slice.
03 - Place 4 bread slices mayonnaise-side up on a flat surface. Top each with lettuce leaves, several tomato slices, and season with salt and black pepper.
04 - Place a second bread slice mayonnaise-side up on top of each first layer. Layer with sliced chicken or turkey, then arrange cooked bacon strips over the meat.
05 - Top each sandwich with another layer of fresh lettuce. Place the final bread slice mayonnaise-side down to complete each triple-decker sandwich.
06 - Insert cocktail sticks through all 4 corners of each sandwich to hold the layers together. Using a sharp knife, cut each sandwich diagonally into quarters to form triangles.
07 - Serve immediately alongside potato chips or pickles if desired.