Place the egg in a small pot of water, bring to a boil, then simmer for 9 minutes; cool in ice water, peel, and slice.
Cook the bacon slice in a skillet over medium heat until crispy, then remove and crumble into small bits.
Season the chicken breast with sea salt, black pepper, and garlic powder.
In the same skillet, add olive oil and sear the chicken for 5-6 minutes per side until the center is opaque and juicy.
While chicken rests, whisk together the Greek yogurt, lemon juice, Dijon mustard, and chopped chives in a small bowl.
Chop the romaine lettuce, halve the cherry tomatoes, and dice the cucumber.
Arrange the lettuce in a bowl and top with sliced chicken, bacon, egg, tomatoes, and cucumber.
Drizzle the creamy herb dressing over the top and serve immediately.