Did you know you can hard cook eggs in the oven? Yuppers - 325*F for 30-35 minutes. Put them directly on the oven rack in a cold oven, and let them sit through the pre-heat. I put a pan of water below them to catch any breaks and to increase the humidity. When they're done, put them in a bowl of cold water until they're completely cooled. That's it!
Max and I prefer them this way, they're less rubbery, and I can do 12-18 just as easily as 5. Very handy when a certain little mister will eat 5-6 egg whites in a sitting (he doesn't like the "ball"). I use the yolks in my breakfast smoothies for an extra dose of protein.