http://www.simplyrecipes.com/recipes/how_to_make_perfect_hard_boiled_eggs/

1. Place the eggs in a single layer at the bottom of a saucepan. Cover with at least an inch or two of cold water. The more eggs that are crowding the pan the more water you should have over the eggs.

2. Heat the pot on high heat and bring the water to a full rolling boil.
Adding a teaspoon of vinegar to the water may help keep egg whites from running out if an egg does crack while cooking. Also some people find adding 1/2 teaspoon of salt to the water helps prevent cracking as well as making the eggs easier to peel.

3. Turn off the heat, keep the pan on the hot burner, cover, and let sit for 10-12 minutes.

4. Pour out the hot water, and run eggs under freezing cold water until they are cool to touch.