Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      tablespoon    margarine
   4                    green onions cut into 1/2
          inch           -- ¥
          pieces        
   2      tablespoons   diced celery
   2      teaspoons     flour
     1/8  teaspoon      salt
     1/8  teaspoon      white pepper
     1/2  cup           skim milk
     1/4  cup           shredded Swiss -- (1 oz.)
                        cheese
   1      package       frozen -- (16 oz.)
                        flounder -- thawed and drained
   1      tablespoon    minced fresh parsley

Preparation:

Melt margarine in a small saucepan over low heat. Add onions and celery; sauté until tender. Stir in flour, sat and pepper; cook 1 minutes stirring constantly. Gradually add milk; stir well. Cook over medium heat until thickened and bubbly, stirring constantly. Add shredded Swiss cheese; reduce heat and cook until cheese melts, stirring constantly. Set aside. Arrange fillets in a single layer in a 10 x 6 x 2 inch baking dish coated with cooking spray. Pour cheese mixture evenly over fillets. Cover and bake at 350F for 25 minutes or until fillets flake easily when tested with a fork. Sprinkle with parsley..