Cook the bacon in a skillet over medium heat for 6–8 minutes until crispy. Remove and drain on paper towels.

Rinse and dry the lettuce leaves, trimming ends to create squares.

Lay 2 lettuce leaves on a plate and spread half of the mayonnaise on them.

Layer deli ham, cooked chicken, and cheese on the mayonnaise-covered leaves.

Place another 2 lettuce leaves on top and spread the remaining mayonnaise on them.

Add tomato slices and crispy bacon on the top layer.

Cover with the last 2 lettuce leaves and secure with toothpicks.

Slice the sandwich diagonally into quarters and serve immediately.