Sounds delish, deb! I have taken a couple classes from Helen & enjoyed them
immensely. In this coffee cake recipe, though, her comment regarding how to substitute for cake flour certainly isn't the way I was taught. I remove 2 Tbsp. of all-purpose flour from 1 level cup of sifted AP flour. And I also see that several sources on the Web recommend mixing in 2 Tbsp cornstarch for the removed 2 Tbsp of all-purpose flour. In other words:
1 cup cake flour = 1 cup sifted all-purpose flour minus 2 Tbsp. of the AP flour plus 2 Tbsp. cornstarch (sift the cornstarch w/ the remaining AP flour before adding to your cake recipe)