Joking aside
Definition 1 of 1
Pro Tip 1/3Serious Transition
The phrase signals a transition from a light-hearted tone to a more serious one within a conversation. 
We all laughed at his impression of the boss, but joking aside, she's a great leader.
Pro Tip 2/3Casual Conversations
It's typically used in informal or casual settings, not in formal writing or speeches. 
You're funny, joking aside, did you finish the assignment?
Pro Tip 3/3Emotional Shift
Using 'joking aside' can demonstrate emotional intelligence by acknowledging the need for a change in tone. 
Joking aside, are you really okay after what happened?