Melt butter in 4-quart saucepan until sizzling; add pepper and garlic. Cook over medium-high heat until pepper is crisply tender (2 to 3 minutes). Add vegetables, meatballs, broth and Italian seasoning. Continue cooking until mixture comes to a boil (10 to 12 minutes).
Add noodles. Reduce heat to medium. Continue cooking, stirring occasionally, until pasta is tender (5 minutes). To serve, top each serving with cheese.
Note:Substitute 1/2 teaspoon each dried basil leaves, dried marjoram leaves and dried oregano leaves and 1/4 teaspoon rubbed sage.