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 with a lid, remove from heat, and let stand for 9 to 10 minutes. Transfer eggs to an ice bath or run under cold water until completely cooled. Peel and slice into ¼-inch rounds.
02 - Toast the bread slices in a toaster or on a sheet pan under the broiler 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 and add the lemon juice, a pinch of salt, and a few grinds of black pepper. Mash with a fork until creamy but still slightly chunky in texture.
04 - Divide the mashed avocado evenly between the two warm toast slices, spreading it to the edges in an even layer.
05 - Arrange tomato slices over the avocado, then layer the sliced hard-boiled eggs on top. Drizzle with olive oil and season with additional salt, pepper, fresh herbs, and crushed red pepper flakes as desired.
06 - Serve immediately while the toast is still warm and crisp.