Preheat your oven to 400°F.
In a bowl, combine lean ground turkey with salt, pepper, and dried oregano. Mix gently to form a uniform blend.
Shape the turkey mixture into small meatballs, about the size of a golf ball.
Place the meatballs on a baking sheet lined with parchment paper and bake in the preheated oven for 15-18 minutes, or until cooked through.
While the meatballs are baking, prepare the tomato sauce. Finely dice the fresh tomato and red onion; mince the garlic.
Heat olive oil in a skillet over medium heat, then add the red onion and garlic. Sauté until the onion softens.
Add the diced tomato to the skillet along with fresh basil, a pinch of salt, and pepper. Simmer for about 5-7 minutes until the tomatoes break down into a chunky sauce.
Meanwhile, prepare the whole wheat spaghetti according to package instructions until al dente, then drain.
Toss the cooked spaghetti with the tomato sauce, and then gently nestle the baked meatballs on top.
Finish with an extra drizzle of olive oil or a sprinkle of fresh basil if desired. Serve warm.