Heat sous vide to 176 °F / 80 °C
In a large bowl, combine the heavy cream, egg yolks, sugar and seeds of the vanilla bean*.
Use an immersion blender to blend until smooth. **
Strain the egg and cream mixture to help disperse any air bubbles.
Slowly pour into 4 ounce mason jars stopping just before the threads on the jar.
Allow to rest for 20-30 minutes or until the majority of the bubbles have popped. This step can be skipped but to ensure a silky smooth top to your creme brulee for the sugar to be caramelized on, I highly suggest resting the cups.
Place a lid and a ring on the mason jar and finger tighten.
Submerge in the heated sous vide and cook for 1 hour.
Remove from the water bath and allow to rest on the counter until cool to the touch.
Once the jars are cool, completely cool them down in an ice water bath.
Once completely cool, remove from the ice water bath and store in the refrigerator until ready for brulee.