01 - Place eggs in a saucepan and cover with cold water by 1 inch. Bring to a rolling boil over medium-high heat, then cover, remove from heat, and let stand for 9–10 minutes. Transfer eggs to an ice bath or run under cold water until cool enough to handle. Peel and slice into rounds.
02 - Toast bread slices in a toaster or on a dry skillet over medium heat until golden brown and crisp on both sides.
03 - Halve the avocado, remove the pit, and scoop the flesh into a mixing bowl. Add lemon juice, a pinch of salt, and freshly ground black pepper. Mash with a fork to a creamy yet slightly chunky consistency.
04 - Divide the mashed avocado evenly and spread it across the warm toasted bread slices, pressing gently to adhere.
05 - Arrange tomato slices over the avocado layer, then top with the sliced hard-boiled eggs. Drizzle with olive oil if desired, and finish with a sprinkle of salt, pepper, fresh herbs, and crushed red pepper flakes.
06 - Serve immediately while the toast is still warm and crisp.