Peel the hard boiled eggs and chop them roughly. Place in a large mixing bowl.
Peel the ripe avocados and remove the pit. Chop roughly and place in the bowl with the eggs. Mix the two ingredients together, smashing them to your desired consistency (the more you mix them, the smoother your egg salad will be).
Add the lemon juice, chives, dill, salt and pepper to your bowl and stir well.
Scoop the egg salad onto the butter lettuce leaves and serve immediately.