In a large bowl, mix together the turkey, egg, breadcrumbs, onion, herbs, salt, feta cheese, and garlic. Mix until the mixture starts to stick together. Then roll the mixture into meatballs about 1.5-2 tablespoons in size. Set aside on a plate.
Preheat the oven to 400°.
Heat the skillet over medium heat and add 1 tablespoon of olive oil to the pan. Once the pan is hot, add the meatballs. Cook the meatballs for 3-4 minutes on two sides, or until nice and golden. Remove the meatballs from the pan. They will finish cooking in the oven.
Add the butter, onion and orzo to the skillet. Cook for 2 minutes, and then add in the garlic, oregano and salt. Cook for another 30 seconds.
Add in the chicken stock, lemon juice and zest. Bring to a boil, and then stir everything well. Add the meatballs back in carefully. Then transfer the skillet to the oven and continue cooking for 15 minutes.
Remove the skillet from the oven and make sure the meatballs are cooked. Sprinkle with feta cheese and serve immediately.