Pat the chicken breast dry with a paper towel and season both sides with sea salt, black pepper, and garlic powder.
Heat the olive oil in a medium skillet over medium-high heat until shimmering.
Place the chicken in the skillet and sear for 6-7 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, dice the avocado, tomato, and red onion into small pieces.
In a small bowl, combine the avocado, tomato, onion, chopped cilantro, and lime juice, tossing gently to incorporate.
Remove the chicken from the pan and let it rest for 3 minutes before slicing across the grain.
Top the sliced chicken with the fresh avocado salsa and serve immediately while the chicken is warm and the salsa is cool.