Sous vide works particularly well when creating confit egg yolks, as temperatures can be kept consistently low for a long time and considerably less energy is used than in an oven or on the stove. Confit egg yolks make a rich, buttery addition to dishes and can also be used to make creamy sauces.
You'll need a water bath and a chamber vacuum sealer to make them, although if you only have a regular bar sealer you can keep the bag uncompressed and sealed and just carefully lower it into the water instead (ensuring no water gets into the oil).
You can also create confit egg yolks in the oven (take a look at our guide on how to do that here), but if you have the correct sous vide equipment, here's how to make them.