Broken bolt in head

Doesn't look too bad. If it is an easy out you can get a center punch and a smaller hammer and attempt to make the easy out "back out" by gently punching it in the opposite direction. Make sure you go the right direction and at right angles. If it's a tap then use a punch to carefully bust it up (they are brittle). You'll need a pick or a scribe to pick out the pieces as you go.