Preheat oven to 400°F.
In a large bowl, combine the yogurt/buttermilk and breadcrumbs. Stir together and allow them to sit for a few minutes. This will help make a moister meatball.
Add ground pork, ground beef, onion flakes, oregano, black pepper, salt, Worchestire sauce, sugar, egg, and ¼ cup parmesan cheese to the breadcrumb mixture. Use gloved hands to mix the ingredients thoroughly.
Use a 2 tablespoon (or desired size) cookie dough scoop to form balls from the meat mixture. You can roll them in your hands for a tighter, more uniform meatball if desired.
Place meatballs on a cookie sheet or in a baking dish coated with non-stick cooking spray. Bake for 13 minutes. (Meatballs do not need to be cooked all the way through; they will cook the rest of the way while simmering in the pasta sauce.)
Meanwhile, cook the spaghetti noodles according to package instructions to al dente. Drain.
Prepare marinara sauce or add 1-2 jars of pre-made spaghetti sauce into a large skillet. Heat over medium until sauce warms through and begins to simmer.
Add enough meatballs (2 large per person or 4-5 small) to the saucepan and simmer for 5-10 minutes or until meatballs are cooked through.
Serve meatballs and sauce over cooked spaghetti. Garnish with parmesan cheese and/or fresh parsley or basil.