01 - Combine olive oil, lemon juice, minced garlic, dried oregano, smoked paprika, salt, and black pepper in a bowl. Add chicken breasts and turn to coat evenly. Let marinate for at least 20 minutes at room temperature.
02 - Place torn kale leaves in a large bowl. Drizzle with olive oil, lemon juice, and a pinch of salt. Massage the kale with your hands for about 1 minute until leaves become slightly softened and turn bright green.
03 - Halve the cherry tomatoes, dice the cucumber, and thinly slice the red onion. Slice the avocado just before assembling to prevent browning.
04 - Whisk together Greek yogurt, olive oil, lemon juice, honey, Dijon mustard, salt, and pepper in a small bowl until smooth and well combined.
05 - Heat a grill pan or skillet over medium-high heat. Cook marinated chicken for 6 to 7 minutes per side until cooked through and internal temperature reaches 165°F. Remove from heat and let rest for 5 minutes before slicing.
06 - Divide massaged kale evenly among 4 bowls. Top each bowl with sliced chicken, cherry tomatoes, cucumber, red onion, avocado, and crumbled feta if desired.
07 - Drizzle the creamy dressing over each bowl and serve immediately while chicken is still warm.