Board Thread:Spoilers!/@comment-26347158-20150418094356/@comment-4839682-20150420160616

In "We Are Both", after Regina has taken Henry from the town hall, (when she conjures up that giant cupcake) she tells him she can teach him to do it himself. This would lend credence to the idea that anyone with a drive and desire can learn magic. Of course, some would be better than others, like in any activity.