Melt the butter in a large skillet or pot over medium heat. Add the onion, carrots, celery, mushrooms, and garlic. Cook for 5 minutes, stirring occasionally, until the vegetables soften and release their liquid.
3 tablespoons unsalted butter, ½ cup chopped yellow onion, 1 cup diced carrots, 1 cup diced celery, 1 cup mushrooms, 3 garlic cloves
Stir in the flour, salt, pepper, thyme, and rosemary, and cook until the flour absorbs the liquid.
¼ cup all-purpose flour, 1 teaspoon salt, ½ teaspoon fresh ground pepper, 1 teaspoon dried thyme leaves, ½ teaspoon finely chopped dried rosemary
Add the broth and milk, and simmer for 7-8 minutes until the mixture thickens into a gravy.
2 cups chicken broth, ½ cup whole milk
Stir in the frozen peas and turkey, then remove from heat. Taste and adjust seasoning with more salt, pepper, thyme, or rosemary if needed. Let the filling cool for 10 minutes.
1 cup frozen peas, 3 cups turkey
Transfer the cooled filling to a 9-inch pie dish.
Carefully place the dough over the filling. Trim the dough edges and fold the overhang to the inside to form a thick crust edge and crimp with a fork or flute with your fingers. Cut slits in the top for steam vents and lightly brush with egg wash (we did a slight square pattern).
1 pie crusts, 1 large egg beaten with 1 tbsp milk
Bake in the air fryer at 320°F (160ºC) for 20 minutes, or until the crust is golden brown. After 10 minutes, cover the edges with aluminum foil or a pie crust shield to prevent over-browning. Remove from the air fryer and cool for 5 minutes before serving.
Serve hot and enjoy!