Preheat oven for 350 degrees. In a pan, sauté onions with olive oil till translucent which is about 15 minutes. Let onions cool. Then in a mixing bowl add the ground turkey, oats, eggs, ketchup, parmesan cheese, parsley and tomato paste to the onions. Then gently mix all together with your hands until combined. Then start to form into small golf ball sized meatballs; about 24 meatballs. Place on a baking sheet lined with parchment paper and a wire rack sprayed with oil about 2 inches apart. Then place in oven and bake for about 20-25 minutes. Let it cool for 5 minutes before serving.