Combine ground beef, egg, bread crumbs, 1/2 teaspoon oregano, cumin and 2 teaspoons Knorr® Beef flavor Bouillon in medium bowl. Shape into 30 meatballs.
Heat 2 teaspoons oil in medium saucepan over medium heat and brown meatballs, in batches, turning occasionally, about 3 minutes. Remove and set aside.
Wipe saucepan clean with paper towel. Add water, remaining 4 teaspoons Bouillon, meatballs and tomatoes and bring to a boil over medium-high heat. Reduce heat and simmer covered 5 minutes.
Heat remaining 1 teaspoon oil in medium skillet over medium-low heat and cook fideos, stirring frequently, until golden, about 1 minute. Drain on paper towels. Add fideos to saucepan. Simmer covered 5 minutes or until fideos are tender. Garnish, if desired, with chopped fresh cilantro and grated cotija or Parmesan cheese.