Bring a small pot of water to a boil and cook the egg for 7 minutes for a jammy yolk, then peel and halve.
Blanch the asparagus in the same boiling water for 2 minutes until tender-crisp, then immediately shock in ice water to preserve the color.
In a small bowl, whisk together the Greek yogurt, lemon juice, Dijon mustard, fresh dill, sea salt, and black pepper to create the dressing.
Place the mixed greens in a large bowl and toss lightly with half of the prepared dressing until coated.
Top the greens with the blanched asparagus, flaked smoked salmon, avocado slices, and the halved egg.
Drizzle the remaining dressing over the top and serve immediately while fresh.