Form 8oz. patties.
Season with salt, pepper, and dried herbs.
Put the patties into sous vide bags.
Cook for 40 minutes at 140F.
Meanwhile, make the feta cream. Whisk egg yolks and cream in a saucepan over low heat until thickened. Fold in the feta cheese, garlic powder, salt, and pepper.
Transfer the patties to an ice bath.
Sear the patties in a hot cast iron pan for a minute per side.
Top the burgers with feta cream and serve on buns with lettuce, red onion slices, and fresh parsley.