Gnocchi, Parisian-Style
["2 lb. frozen gnocchi", "3 Tbsp. margarine", "1 small onion, grated", "2 Tbsp. flour", "1 c. half and half", "1 c. chicken broth", "1/2 c. shredded Swiss cheese", "1/2 c. grated Parmesan cheese"]
["Cook gnocchi according to package directions.", "Set aside."]
["frozen gnocchi", "margarine", "onion", "flour", "chicken broth", "Swiss cheese", "Parmesan cheese"]