I have searched for the words Hand Crossbow and Crossbow Expert but didn't find this Q&A, which is awkward as it's cited many times. 1
The Crossbow Expert feat states:
When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a hand crossbow you are holding.
A hand crossbow is a one-handed weapon, so if you attack with it, can you attack again with the same hand crossbow as your bonus action?
1 As I said, the answer itself is cited in many other questions, but I didn't find any question that actually asked it. I think the question itself is useful so people can easily refer to it, and possibly we get less "dual wielding crossbow expert" questions with answers clarifying that they don't need the second crossbow.