The answer depends upon stress.
If it’s, “How are YOU creative?” then I think the question is a little insulting and I wouldn’t dignify it with a response.
If: “How are you CREATIVE?” (then it’s missing a comma before the last word, but) I’ll just say, “Very well, thanks for asking.”
If: “How ARE you creative?” Then I’ll assume it’s as opposed to how I was creative in the past, and would reply, “Better, thanks for asking.”
If: “HOW are you creative?” The answer is, of course, “practice!”
Tiger Riding for Beginners 