1 basic pie dough recipe , rolled out and lining a 9- or 10-inch pie dish, or 8 x 8-inch baking dish, frozen for at least 30 minutes (or 1 deep-dish frozen pie crust)
2 tablespoons butter
1 pound cremini or button mushrooms , sliced 1/4-inch thick
4 to 5 shiitake mushrooms , caps only, sliced (optional)
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