Butterscotch Nut Fudge
["1/4 c. butter or margarine", "1 c. brown sugar", "1 c. granulated sugar", "3/4 c. sour cream", "1 tsp. vanilla", "1/2 chopped nuts"]
["Melt butter in heavy saucepan, add brown sugar and heat to boiling.", "Add granulated sugar and sour cream.", "Cook over low heat, stirring until sugar dissolves, to soft ball stage (235\u00b0). Cool at room temperature, without stirring, until lukewarm (110\u00b0). Beat until mixture holds its shape.", "Add vanilla and nuts, quickly spread in greased pan.", "Cool and cut in squares."]
["butter", "brown sugar", "sugar", "sour cream", "vanilla", "nuts"]