01 - In a bowl, mix olive oil, lemon juice, garlic, oregano, paprika, salt, and pepper. Add chicken breasts, turn to coat, and marinate for at least 20 minutes.
02 - Place kale in a large bowl. Drizzle with olive oil, lemon juice, and a pinch of salt. Massage with hands until leaves are slightly softened and bright green, about 1 minute.
03 - Slice cherry tomatoes in half, dice cucumber, and thinly slice red onion. Slice avocado just before serving to prevent browning.
04 - Whisk Greek yogurt, olive oil, lemon juice, honey, Dijon mustard, salt, and pepper in a small bowl until smooth and fully combined.
05 - Heat a grill pan or skillet over medium-high heat. Cook marinated chicken 6-7 minutes per side, or until internal temperature reaches 165°F. Remove and let rest 5 minutes before slicing.
06 - Divide massaged kale among 4 bowls. Top each with sliced chicken, tomatoes, cucumber, red onion, avocado, and feta if using. Drizzle with dressing and serve immediately.