Add chicken to a mixing bowl.
Add olive oil, lemon zest, lemon juice, garlic, oregano, thyme, lemon pepper seasoning, salt, and black pepper.
Mix thoroughly and allow to marinate while preparing the remaining ingredients.
Chop the romaine.
Dice the cucumber and red onion.
Halve the cherry tomatoes and olives.
Prepare the banana peppers and parsley.
Add all vegetables to a large salad bowl.
In a separate bowl, whisk together olive oil, lemon juice, red wine vinegar, Dijon mustard, oregano, salt, and black pepper until smooth.
Heat a large skillet or grill pan over medium heat.
Cook the chicken for 5 to 7 minutes per side until golden brown and the internal temperature reaches 165 degrees.
Remove the chicken and allow it to rest for 5 to 10 minutes.
Slice the chicken against the grain.
Top the salad with sliced lemon chicken.
Add feta cheese and parsley.
Drizzle with the lemon dressing.
Toss lightly and serve.