Heat oven to 350 degrees. ... cup butter and fudge topping, stirring constantly until smooth. ... flour and remaining cake ingredients except 1 cup walnuts and chocolate chips; beat at ... Serve warm or cool.
In large bowl, cream butter. ... frosting mix, and walnuts until well blended. Bake in ... minutes. Since the cake has the soft tunnel of fudge, ordinary doneness tests can ... the "Tunnel of Fudge".