Bring a large pot of salted water to a boil and cook the whole wheat spaghetti according to package directions until al dente, then drain and set aside.
While the pasta cooks, finely mince the yellow onion and garlic.
In a medium mixing bowl, combine the ground turkey, minced onion, garlic, dried oregano, sea salt, and black pepper, mixing gently with your hands.
Form the turkey mixture into 5 evenly sized meatballs.
Heat the olive oil in a non-stick skillet over medium heat and sear the meatballs for 2-3 minutes per side until a golden crust develops.
Pour the marinara sauce into the skillet with the meatballs, reduce heat to low, cover, and simmer for 8 minutes until the meatballs are cooked through.
Place the cooked spaghetti in a bowl, top with the meatballs and sauce, and garnish with grated parmesan cheese and fresh chopped parsley.