Heat a sous vide water bath to 155F degrees.
Combine the salt, spices, bay leaf and thyme in a bowl and toss to mix together.
Rub the spice mixture over the beef cheeks with the dijon mustard.
Place the beef cheeks with any remaining spice mixture and the brandy in a sealable bag.
Vacuum seal the bag and cook in the water bath for 48 hours.
Remove from water bath and take the beef cheeks out of the bag, reserving the liquid. Pat dry.
Heat a skillet over medium-high heat and add the mushrooms.
Cook until lightly browned and starting to lose their liquid.
Add the reserved liquid from the bag and simmer for 2-3 minutes, until the mushrooms are softened and cooked through.
Add the cream and simmer 3-5 minutes to thicken slightly. Set aside and keep warm.
Heat a cast iron skillet over high heat.
Add the avocado oil and then the beef cheeks. Sear for 60 seconds on each side, until a golden crust forms.
Remove, slice and serve over egg noodles with mushroom gravy.