Cordon Bleu Casserole

Cordon Bleu Casserole
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4 cups cubed cooked turkey
3 cups cubed fully cooked ham
1 cup (4 ounces) shredded cheddar cheese
1 cup chopped onion
1/4 cup butter
1/3 cup all purpose flour
2 cups half and half creme
1 teaspoon dill weed
1/8 teaspoon ground mustard
1/8 teaspoon ground nutmeg
Topping:
1 cup dry bread crumbs
2 tablespoons butter, melted
1/4 teaspoon dill weed
1/4 cup shredded cheddar cheese
1/4 cup walnuts
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In a large bowl, combine turkey, ham, and cheddar cheese; set aside. In a saucepan,saute onion in butter until tender. Add flour; stir to form a paste. Gradually add cream, stirring constantly. Bring to a boil; boil 1 minute or until thick. Add dill weed and nutmeg; mix well. Remove from the heat and pour over meat mixture. Spoon greased 13 in x 9 in x 2 in baking dish. Toss bread crumbs, butter and dill weed; stir in cheese and walnuts. Sprinkle over the casserole. Bake, uncovered, at 350 degrees for 30 minutes or until heated through.