Prepare pie crust and chill in refrigerator until ready to roll out.
1 [double pie crust recipe]
Prepare the pie filling by combining the peeled and sliced apples, cranberries, sugar, cornstarch and cinnamon in a large bowl. Toss to distribute evenly and set aside while oven preheats.
4-5 medium apples, 1 1/2 cups cranberries, 3/4 cup (150g) granulated sugar, 2 Tablespoons cornstarch, 2 teaspoons ground cinnamon
Heat oven to 400°F.
Roll out bottom crust on a floured surface and carefully transfer to a pie dish. Spoon cranberry apple filling into the crust, leaving behind any excess juices in the bowl. Dot the top of the filling with the butter.
2 Tablespoons salted butter
Roll out top crust on the floured surface then transfer to cover the filling, cutting slits in the top to vent while baking. Alternatively, you can make a decorative top crust by cutting small holes in a pattern with a small circle cutter or cutting strips and weaving a lattice top.
Trim the edges of the crust and crimp using your thumb and forefinger to finish the edges, then brush the crust all over with a beaten egg wash.
1 large egg
Place the pie on a baking sheet and bake for 20 minutes at 400°F. Without removing pie from oven, decrease the baking temperature to 350°F and continue baking another 40-50 minutes, until the crust is golden brown and the filling is bubbling. You may need to use a pie crust shield to protect the edges from browning too much.
Remove from oven and allow to cool for 3-4 hours before slicing. Filling will thicken as it cools.