First, remove the magazine.

You may find that removing the magazine is extra difficult, as the pressure from the jam will make it harder to remove.

Pull it sharply.

This often results in the top round in the magazine falling out.

Do not discard the magazine.

There may come a time when you will be very glad to have those rounds.

Place the mag in your shooting hand's little finger.

Grab the slide with the support hand and rack the slide to the rear, 2 or 3 times, quickly.

Some people suggest turning the pistol over slightly to facilitate the rounds falling out easily.

Reinsert the magazine into the pistol.

Then, do the usual...

Tap, Rack, Bang.