01 - Place eggs in a saucepan and cover with cold water. Bring to a rolling boil, then cover the pot and reduce heat to a simmer. Cook for 9 to 10 minutes. Transfer eggs to a bowl of ice water or run under cold water until cool enough to handle. Peel and slice into rounds.
02 - Place bread slices in a toaster and toast until golden brown and crisp on the edges.
03 - While the bread toasts, halve the avocado and remove the pit. Scoop the flesh into a mixing bowl and 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 it across both warm toasted bread slices, pressing gently to adhere.
05 - Arrange tomato slices over the avocado spread, then top each toast with the sliced hard-boiled egg.
06 - Drizzle with olive oil if desired. Season with additional salt, pepper, fresh herbs, and a pinch of crushed red pepper flakes. Serve immediately while the bread is still warm and crisp.