Season the chicken breasts with olive oil, garlic powder, oregano, salt, and pepper.
Heat a grill pan or skillet over medium heat, and cook the chicken for about 6-7 minutes on each side, until golden brown and cooked through (internal temperature should reach 165°F/74°C).
Let the chicken rest for a few minutes before slicing it into thin strips.
Make the Dressing:
In a small bowl, whisk together olive oil, red wine vinegar, Dijon mustard, honey (if using), salt, and pepper until well combined. Adjust seasoning as needed.
Assemble the Salad:
In a large bowl, combine the diced avocado, cucumber, red onion, cherry tomatoes, Kalamata olives, and feta cheese.
Add the sliced chicken on top.
Dress the Salad:
Drizzle the dressing over the salad and gently toss to combine, ensuring all ingredients are well-coated.
Garnish & Serve:
Garnish with fresh parsley or basil, and serve immediately.