Stir together mayo,chives and a pinch of each salt and pepper. Spread 4 slices of toast with some of the mayo and top with half of egg,tomato,bacon and herbs. Spread both sides of 4 more slices of toast with mayo and place on top. Cover with remaining egg,tomato,bacon,herbs and toast (spread with mayo).
Secure sandwiches with toothpicks and cut as desired.