Preheat the oven to 375° F. First make the sauce. Heat olive oil in a large pot over medium high heat. Saute onion until translucent and soft, around 4-6 minutes. Add crushed tomatoes, tomato paste, and remaining seasoning. Simmer for 15 minutes. (You may need to add 1/2 cup water to make the sauce a consistency you prefer).
In a large bowl, make the meat balls. Use your hands to combine all ingredients together. Being careful not to overwork the meat.
In another pan on the stove heat 2 Tbsp. olive oil and sear the meatballs for 2-3 minutes on each side. Then place the meatballs in the sauce in an oven safe dish (like a cast iron) and bake for another 15 minutes, or until the meat is cooked all the way though. (160 degree F to be safe). Serve with couscous/orzo/rice and fresh veggies!