Preheat the oven to 375 degrees. Pour the marinara sauce in a large skillet or baking dish and set aside.

Heat the olive oil in a skillet over medium heat. Add the spinach and cook until wilted, then add the garlic and cook 30 seconds more. Remove the spinach from heat and coarsely chop on a cutting board.

Place the ground turkey in a medium bowl. Add the chopped spinach, egg, breadcrumbs, crumbled feta cheese, oregano, salt and pepper and mix gently with your hands until the ingredients are incorporated. Be careful not to over mix as this will toughen the meat.

Form about 2 tablespoons of the turkey mixture into a ball and place in the skillet with marinara. Repeat with the remaining turkey mixture.

Bake the turkey meatballs for 20-25 minutes, checking for doneness after 15 minutes, or until a thermometer inserted into the center of a meatball registers 165 degrees. Remove from heat. Garnish with parsley as desired and enjoy!