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Season the chicken breast with the kosher salt and black pepper, and then cut them into 1 inch cubes.
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In a medium bowl, toss together half of the dried bread cubes with half of the instant stuffing mix and set this mixture aside.
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In a separate bowl, combine the remaining half of the bread cubes and instant stuffing mix, then add the sliced mushrooms, onions, celery, poultry seasoning and sage. Add the turkey gravy and cream of chicken soup. Mix all the ingredients until well blended.
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Place the reserved mixture of breadcrumbs and stuffing mix into the bottom of a slow cooker. Layer it with the cubed chicken breast, then cover the chicken with the mixture of bread cubes, vegetables, soup and gravy.
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Cover the pot with a lid and turn the temperature to low. Cook for 4 to 6 hours.