Preheat oven to 450°F.
Toss the pears with the brown sugar, flour, lemon juice, cinnamon, nutmeg, and salt.
10 medium ripe pears, ½ cup brown sugar, 2 tbsp all-purpose flour, 1 tbsp lemon juice, 1 tsp ground cinnamon, ¼ tsp ground nutmeg, ¼ tsp kosher salt
Line a 9-inch pie pan with one crust, cutting away any excess dough from the edges.
2 9-inch refrigerated pie crusts
Transfer the pears to the pie crust.
Arrange the small pieces of butter over the pears.
1 tbsp unsalted butter
Cover the pie with the second crust, trimming the excess dough, and pinching the edges of the 2 crusts together.
Beat the egg and a splash of water in a small dish. Brush the egg wash over the crust.
1 large egg
Cut a few slits in the top crust for venting.
Bake for 10 minutes and then reduce the oven temperature to 350°F.
Bake for another 30-35 minutes. Check the pie halfway through and cover with aluminum foil if the crust is becoming too browned.