Place 1 slice of toasted bread on a cutting board. Spread with 1 tablespoon of pesto mayonnaise. Top with lettuce and sliced tomatoes. Place a warmed chicken breast on top of tomatoes. Top chicken breast with 2 slices of bacon. Spread another tablespoon of pesto mayonnaise over a second slice of toasted bread and place, mayo side down, on top of bacon. Repeat for a second sandwich.
TIP: If you can’t find pesto mayonnaise in the grocery store, you can easily make it by mixing together 3 tablespoons mayonnaise with 1 tablespoon prepared pesto.