Hollis, good questions! We wouldn't suggest using heavy cream powder, as this recipe calls for nonfat dry milk specifically. The potato flour isn't 100% necessary, but you may find that your buns are less flexible and prone to cracking if you make them without anything to replace it. Head over to How to substitute for potato flour for good alternatives. For a refresher on mixing and kneading dough by hand, we'd visit our Yeast Baking Guide. About halfway down you'll find a video on kneading bread dough, as well as other videos that you might find handy! And finally, happy birthday! We don't have any special birthday deals, but if you're looking for the perfect Classic Birthday Cake recipe, we've got you covered. Happy baking! Kat@KAF

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