I get this question a lot (which I am thankful for - it's nice to know people want to try my writing!). I never know what to say. It seems to be as daunting for me to choose one as it is for a potential reader.
When it comes to standalone one off books then The Christmas Throwaway, Deefur Dog and The Decisions We Make, are all popular.
I do like writing Christmas stories - I have quite a few of them!
What all my stories have in common is romance, and a HEA!