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1
Place the chicken breasts skin side up on a cutting board. Use your fingers to gently pry the skin away from the breasts, making sure to keep the skin attached to the breasts. You simply want to create a small pocket of space between the skin and the breast meat.
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2
Using a mandolin or truffle shaver, shave half of your truffle into very thin disks. Place these disks underneath the skin of the chicken. The skin of the chicken should hold the truffles in place.
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3
Season the flesh side of the chicken breasts with salt, then place the chicken inside the gallon size bag. Add the milk, thyme, and bay leaves to the bag. Let the chicken marinate overnight, or for at least 4 hours.
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4
Set a large pot of water over medium heat. Use a thermometer to monitor the temperature of the water. When the temperature of the water is between 170 and 180 F, place the sealed bag of chicken inside the pot of water. Try to get rid of any large pockets of air inside the bag before adding to the pot.
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5
Continue to monitor the temperature of the water. Now that you have added the chicken, you want the temperature to stay between 145 and 155 F. Adjust the heat as necessary to achieve this temperature. Let the chicken cook for 1 hour.
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6
After 1 hour, remove the bag from the water. Remove the chicken from the bag, pat it dry with a towel, and let it rest momentarily on a large plate. Discard the bag along with everything inside of it. Set a skillet over medium heat, and add 1 tablespoon of butter. When the butter is melted and beginning to sizzle, add the chicken skin side down. Let the chicken cook for 3-4 minutes. Use tongs to lift the chicken and check if the skin has browned nicely. When the skin looks brown and crispy, flip the chicken and cook the flesh side for 3-4 minutes. Remove the chicken from the skillet.
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7
Deglaze the skillet with white wine. When the wine has reduced by at least half, add the stock. When the contents of the skillet have again reduced by at least half, add the remaining 1 tablespoon of butter and whisk to incorporate. Season the sauce lightly with salt, taste, and adjust with more salt as necessary. Add the chicken back into the skillet. Shave the remaining half of the black truffle over the top of the chicken and into the sauce. Serve and enjoy.
