I came across this article and read it out of curiosity. It’s a method for teachers to help children ask the right questions, but it struck me as a potential tool for writers’ groups. Looks like an easy way to get out of the “oh-it’s-really-nice” rut. There’s even a pattern for making a die you can roll to pick which question to answer.
You could probably use it by yourself if you aren’t part of a group.

The Question Game: A Playful Way To Teach Critical Thinking