In large skillet, brown ground beef over medium-high heat 6 to 8 minutes or until beef is no longer pink, breaking up into 3/4" pieces.
Remove beef with slotted spoon; pour off drippings.
In same skillet, add broth, tomatoes and pasta, pushing pasta into liquid. Bring to a boil, reduce heat to medium. Cook, uncovered 15 minutes stirring frequently.
Add zucchini; continue cooking 5 minutes or until pasta is tender.
Return beef to skillet and stir in 1/2 cup cheese; heat through. Sprinkle with remaining cheese.
Servings: 4