Preheat oven to 350 degrees F (175 degrees C).
Put 1 egg in each of 12 muffin cups.
Bake in preheated oven for 30 minutes.
Plunge baked eggs in a large bowl filled with ice water until cooled completely, about 10 minutes.
If your oven runs hot, you may need to reduce the temperature to 325 degrees F (165 degrees C).
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