01 - In a skillet over medium heat, cook turkey bacon until crisp, about 5 minutes per side. Drain on paper towels.
02 - Toast the bread slices until golden brown.
03 - Spread a thin layer of mayonnaise on one side of each toasted bread slice.
04 - Place one slice of bread mayonnaise-side up on a work surface. Layer with half the lettuce leaves, half the turkey slices, and half the tomato slices. Season with salt and pepper.
05 - Top with a second bread slice, mayonnaise-side down. Spread mayonnaise on the top of this slice as well.
06 - Layer half of the avocado slices and three slices of turkey bacon on top.
07 - Close the sandwich with the third bread slice, mayonnaise-side down.
08 - Press down gently, secure with toothpicks, slice into halves or quarters, and serve immediately.