Season the chicken thighs with salt and pepper.
Heat one tablespoon of olive oil over medium heat in a large skillet.
Add the chicken to the pan and sear for 2-3 minutes per side. Remove the chicken to a plate, cover, and set aside.
To the same skillet, add the remaining olive oil over medium heat. Add the onion and cook, stirring occasionally, for 2-3 minutes or until the onion becomes translucent. Add the garlic and cook for one more minute.
Add the orzo to the pan, and sauté it, stirring for another minute or two until it becomes lightly browned,
Carefully add wine to deglaze the skillet. Continue cooking for 2-3 minutes or until the wine reduces by half.
Add the chicken broth, lemon juice, and zest, and bring to a steady simmer.
Place the chicken and any accumulated juices on top of the orzo.
Cover with a lid and cook for about 15-20 minutes until the chicken is cooked through. Test the chicken using an instant-read thermometer. The internal temperature of the chicken thighs should be 170°F.
Add spinach and continue for 1-2 minutes or until the spinach wilts.
Add in the half and half and stir well until the orzo becomes very creamy.
Sprinkle with fresh parsley and crumbled feta, and serve.