01 - Whisk together olive oil, lemon juice, minced garlic, dried oregano, smoked paprika, salt, and black pepper in a mixing 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 pinch of salt. Massage kale with clean hands for approximately 1 minute until leaves become slightly softened and turn bright green.
03 - Halve cherry tomatoes, dice cucumber, and thinly slice red onion. Set aside. Slice avocado just before assembling to prevent browning.
04 - Combine Greek yogurt, olive oil, lemon juice, honey, Dijon mustard, salt, and pepper in a small bowl. Whisk vigorously until completely smooth and well incorporated.
05 - Heat grill pan or skillet over medium-high heat. Remove chicken from marinade and cook for 6 to 7 minutes per side until internal temperature reaches 165°F and juices run clear. Transfer to cutting board and let rest for 5 minutes before slicing.
06 - Divide massaged kale evenly among 4 bowls. Arrange sliced chicken, cherry tomatoes, cucumber, red onion, avocado, and feta cheese on top. Drizzle with yogurt dressing and serve immediately.