This is my mother-in-law's gravy recipe, served every Thanksgiving. It is what makes the meal, in my opinion! I love gravy and I love mushrooms so the combo couldn't be better. If there was one thing I ever wanted her to teach me, it was this recipe! *This recipe follows for a 12 pound turkey roasted. If your turkey is larger, you will need to adjust the water & cornstarch ratios accordingly.

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