Preparation:

Combine beef, onions, salt, egg substitute, bread crumbs, and ketchup in mixing bowl. Heat pan on medium high and coat with nonstick spray. Form about 12 meatballs (each approximately 1 inch in diameter) and place on pan. Turn meatballs every couple of minutes until entire meatball is cooked. 

Meanwhile, bring 8 cups of water to a boil. Add spaghetti and cook to desired texture, or about 8 minutes. Heat tomato sauce in separate pot. 

Drain pasta and divide into six equal bowls. Top each bowl of spaghetti with two meatballs, 1/3 cup heated tomato sauce, and 1 tsp Parmesan cheese before serving.