Raspberry Bars
["1/2 c. butter, softened", "1/2 c. margarine, softened", "1 c. sugar", "2 egg yolks", "2 c. flour", "1 c. chopped walnuts", "1/2 c. raspberry preserves"]
["Baking Temperature: 325\u00b0.", "Baking Time: 50 minutes."]
["butter", "margarine", "sugar", "egg yolks", "flour", "walnuts", "raspberry preserves"]