I recently gave a 3 question quiz worth 3 points. I made a typo on one question that led to none of the multiple choice questions being correct. What is the best way to handle this? Give everyone credit for that question? Curve the quiz one point upwards? Remove that question from the grade?
I would give everyone credit. It ameliorates any issues with people complaining they spent time on that question to the detriment of the others (like removing would). If all your quizzes are worth three points, it keeps that consistent too.
My answer might be different for something higher-stakes, but earn good will by just scoring it for everyone.
Curving (if you mean adding 1 to each score) doesn't make any sense, since those that randomly got it "correct" would get an extra point for no reason.