Place the bacon slice in a cold skillet and turn the heat to medium. Cook until the fat has rendered and the bacon is crispy, then remove and chop into small bits.
Season the chicken breast with half of the sea salt and black pepper. In the same skillet with the remaining bacon fat, sear the chicken for 5-7 minutes per side until cooked through and golden brown.
While the chicken rests, prepare the dressing by whisking together the Greek yogurt, lemon juice, garlic powder, onion powder, dried dill, and the remaining salt and pepper in a small bowl.
Chop the romaine lettuce, halve the cherry tomatoes, and slice the cucumber. Dice the avocado into bite-sized pieces.
Slice the rested chicken breast into strips.
In a large bowl, toss the romaine, tomatoes, and cucumber with the creamy ranch dressing until well coated.
Top the salad with the sliced chicken, avocado, and crispy bacon bits before serving.