Preheat oven to 325 degrees F and place the oven rack in the center. Place an egg in each well of the muffin tin. When the oven is heated, place the muffin tin (or tins--you can make as many as you can fit in your oven) into the oven and bake for 30 minutes.

When the eggs have about 5 minutes remaining, fill a bowl with ice water. When the eggs have baked for 30 minutes, remove from the oven and carefully transfer each egg to the bowl of ice water and allow to chill for 10-15 minutes. Store the eggs in their shells until you're ready to eat them.