Take a picture of the mirror. Step forward, turn around take another picture then....
Prophet Izaach wrote:
Literally done in like 4 minutes.

It sucks because I spent like 4 minutes on it, but straight on this is the only way.
Edit: After reading your post six more times and the following posts 12 more times, it seems that you want to take a picture of a mirror with absolutely nothing in the background. My question is, what is your background? A black hole?