If necessary, refrigerate one filled cake pan while baking the other two cake layers.
Unforgettable White Chocolate Frosting
In a heavy saucepan, melt 18 ounces chopped white chocolate baking squares or bars over low heat. Cool until slightly warm. In a large bowl, beat 3 ounces softened cream cheese with an electric mixer until smooth. Add 1 1 1/2 cups cut-up butter to cream cheese; beat until fluffy. Gradually add cooled chocolate, beating until well blended.