Prepare meatballs according to package directions.
Meanwhile, in a large saucepan, melt butter. Stir in flour until smooth; gradually add broth. Bring to a boil; cook and stir until thickened, 1-2 minutes. Stir in cream and dill; simmer for 1 minute. Stir in meatballs; heat through. Garnish with parsley if desired.