In a medium bowl mash avocado. Add onions, lemon (lime) juice, salt, pepper, parsley (dill or chives), and eggs. Mix to combine. Add more salt and pepper if needed.

You can either lightly toast bread in a skillet on the stove top, or toast it in a toaster. If using the skillet method, I suggest to lightly spray skillet with oil (butter) spray, so bread doesn't stick and burn. Spread salad over 1 slice of toasted bread and top with another (slice of bread). Cut in half. Recipe makes enough for about 4 sandwiches (or 8 halves).