01 - Place eggs in a saucepan and cover with cold water. Bring to a rolling boil, then cover the pot, remove from heat, and let stand for 9 to 10 minutes. Transfer eggs to an ice bath or run under cold water until cool enough to handle. Peel and slice into rounds.
02 - Toast the bread slices in a toaster or on a dry skillet over medium heat until golden brown and crisp on both sides.
03 - While the bread toasts, halve the avocado and remove the pit. Scoop the flesh into a mixing bowl. Add lemon juice, salt, and black pepper. Mash with a fork to a creamy yet slightly chunky consistency.
04 - Divide the mashed avocado evenly and spread generously over each warm toast. Arrange tomato slices over the avocado layer, then top with the sliced hard-boiled eggs.
05 - Drizzle with olive oil if desired. Season with additional salt and pepper, sprinkle with fresh herbs and crushed red pepper flakes. Serve immediately while the bread is still warm and crisp.