What’s the best way to add flavor to cheesecake?

I came home to over 200 comments and emails, so don’t mind if I answer a few in the main window here. This one from reader Hattie I especially like because, well, I love that name. But also because there are so many different ways to answer it.
I’ll be honest and say at the outset that a plain vanilla cheesecake is my personal favorite. However I recognize that there are plenty of cheesecake makers out there who consider plain cheesecake to be a mere starting point, a blank canvass if you will. For those folks I have a few basic suggestions.
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