Hard boil the eggs, then cool and peel them.

Chop the boiled eggs and place them in a mixing bowl.

Add mayonnaise, Dijon mustard, fresh dill, salt, and black pepper to the bowl.

Mix until combined and creamy.

Toast the whole grain bread.

Assemble the sandwich by placing lettuce, sliced tomatoes, sliced avocado, and egg salad on the toasted bread.