Prepare a cookie baking sheet by pouring half a cup of the marinara sauce and spread it evenly over the surface.
In a large bowl mix all meatball ingredients well so that everything is well incorporated. Shape into meatballs.Place the meatballs on the baking sheet and bake for about 20 minutes.
In the meantime melt the butter in a large sauce pan and add chopped onion and saute until onion is translucent. Add chopped garlic and saute for another minute, making sure garlic doesn't burn. Add marinara sauce and the rest of the sauce ingredients and stir. Add meatballs and make sure toss them around a bit to make sure they are fully covered in sauce. Bring to a boil, reduce heat to low and simmer for around 30 minutes.
Serve with mashed potatoes or your favorite side dish.
Please keep in mind that nutritional information is a rough estimate and can vary greatly based on products used.