01 - Bring a medium saucepan of water to a gentle boil. Carefully lower in the eggs and simmer for 6–7 minutes for soft-boiled yolks. Transfer eggs to an ice bath and let cool for 2 minutes, then peel.
02 - While eggs cook, toast the bread slices until golden and crisp.
03 - In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, salt, and pepper to make the dressing.
04 - In a large bowl, toss mixed greens and cherry tomatoes with half of the dressing.
05 - Arrange toasted bread on serving plates. Top each with sliced avocado and dressed greens.
06 - Halve the soft-boiled eggs and place on top. Drizzle with remaining dressing and garnish with chives and flaky sea salt.