While egg cookers vary in the exact way they operate, all use gentle heat to cook eggs. Many employ steam to moderate the temperature; a reservoir of water keeps the interior at a steady 212°F ...

The Gourmet Egg Cooker, which looks like it could be R2D2's pet, is designed to cook up to seven boiled eggs or three poached eggs at once. It measures 8.5 inches across and 6 inches high.

The Dash Rapid Egg Cooker ($19.99) allows you to make up to six hard-boiled eggs in half the time of traditional methods with absolutely no guesswork. The mini appliance heats water to steam eggs ...