Add all ingredients to a small blender and blend until well-combined and creamy. Use immediately or store in a sealed jar in the refrigerator for up to 2 weeks.
Bake the Chicken:
Place chicken in a sealable bag or container along with oil, lemon juice, herbs, and sea salt. Seal the bag and move everything around until well-coated. Marinate 15 minutes or up to 8 hours.
When you're ready to bake the chicken, preheat the oven to 350 degrees F and place chicken in a casserole dish.
Bake on the center rack of the preheated oven 25 to 30 minutes, or until chicken is cooked through.
Transfer chicken to a cutting board and allow it to rest 10 minutes before slicing. This allows the juices to distribute throughout the meat, yielding the most tender result.
Chop the chicken into cubes (Note: you can refrigerate the chicken prior to chopping if you prefer chilled chicken in your salad).
Make the Salad
Divide the spinach, cherry tomatoes, red onion, cucumber, avocado, feta cheese, and pine nuts among 4 large salad bowls. Top with herby roast chicken and Greek salad dressing. Enjoy!