Preheat oven to 425
Melt the butter in a large saucepan over med heat. Stir in the onions, mushrooms, garlic, cook until tender but NOT browned - about 5 min.
Stir in the flour, sage and thyme until blended.
Our in the gravy, & milk, stirring to blend.
Bring to a boil over med-high heat, cook about 1-2 min.
Stir in the turkey & vegetables & cook until vegetables are tender - about 5 min.
Line a 10 in pie plate with a bottom crust.
Pour in the turkey mixture.
Cover with the top crust.
Seal & crimp the edges.
Pierce top crust in a few pieces with a fork. Cover the edges of the pie with strips of aluminum foil.
Bake for 25 min. Remove foil strips and bake until crust is golden - about 20 min. Remove from oven & rest 10 min before serving.