Preheat a sous vide circulator or combination oven to full steam only at 155°F.
Place the egg yolks in a stainless steel mixing bowl.
Whisk the yolks together until fully dispersed and as fluid as possible.
Pour the yolks into a cryovac bag or zip lock bag. Cryovac the yolks.
Cook the yolks at 155°F for about 35 minutes. You can do this in the combi oven by adding a half-size hotel pan filled halfway with water to act as a water bath. Place the cryovac of yolks in the bath and put in the combination oven at full steam for 35 minutes.