01 - Whisk together olive oil, lemon juice, minced garlic, dried oregano, smoked paprika, salt, and pepper in a bowl. Add chicken breasts and turn to coat thoroughly. Let marinate for at least 20 minutes.
02 - Place torn kale leaves in a large bowl. Drizzle with olive oil, lemon juice, and a pinch of salt. Massage with your hands for about 1 minute until leaves soften and turn bright green.
03 - Halve the cherry tomatoes, dice the cucumber, and thinly slice the red onion. Slice the 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 creamy.
05 - Heat a grill pan or skillet over medium-high heat. Cook marinated chicken for 6–7 minutes per side until cooked through and internal temperature reaches 165°F. Let rest for 5 minutes before slicing.
06 - Divide massaged kale evenly among 4 bowls. Top each with sliced chicken, cherry tomatoes, cucumber, red onion, avocado, and feta cheese if using.
07 - Drizzle with prepared dressing and serve immediately while chicken is still warm.