Turkey Potpie

Preheat oven to 350 degrees F. Coat a 9 1/2-inch pie pan with cooking spray. Heat 1 teaspoon oil in a large nonstick skillet over medium-high heat. Add onion, carrot and celery; cook, stirring often, until softened and lightly browned, about 7 minutes. Transfer to a medium bowl.

Heat the remaining 2 teaspoons oil in the skillet over medium-high heat. Add mushrooms; cook, stirring often, until browned and tender, about 5 minutes. Add garlic, sage and thyme; cook, stirring constantly, until fragrant, about 1 minute. Return the onion mixture to the pan. Whisk broth and cornstarch in a measuring cup or bowl until smooth; add to the pan. Bring the mixture to a boil, stirring occasionally. Stir in turkey, peas, sour cream, pepper and salt. Remove from heat.

Transfer the mixture to the prepared pie pan. Invert crust and place on top of the turkey mixture; slice a couple of slits in the center of the crust. Bake until golden and bubbly, about 45 minutes. Let stand for 10 minutes before slicing and serving.