Lay tortilla on a cutting board. Place 1/4 cup lettuce in a line just below the center of the tortilla. Top with about 2/3 cup chicken mixture, 1/4 cup cheese, 2 tablespoons tomato, and 2 slices bacon (if using). Drizzle with 2 tablespoons dressing. Fold bottom edge of the tortilla up and over filling. Fold in opposite sides; roll up from bottom. Repeat with remaining tortillas and fillings. Cut wraps in half. Serve immediately or wrap tightly in plastic wrap and refrigerate up to 24 hours.