Preheat oven to 400°F.
In a large bowl, combine the sugar, flour, salt, nutmeg, cinnamon, and melted butter, and toss with the sliced apples, until they are completely coated.
½ cup granulated sugar, ¼ cup all-purpose flour, ½ teaspoon kosher salt, ½ teaspoon ground nutmeg, ½ teaspoon ground cinnamon, 2 tablespoons unsalted butter, 5 granny smith apples
Fill the bottom pie shell with the apple mixture and spread evenly.
1 store-bought refrigerated pie crust
Roll out the remaining dough and place over the filling. Crimp or flute the edges to seal the bottom and top crusts together. To pinch the edges, place your index finger on the inside of the crust and use your other index finger on the outside of the crust, to make a ruffle. Pinch the top and bottom crusts together as you make the ruffle, to seal the pie.
Cut a few small holes or use a fork to place holes in the top crust for venting, unless doing lattice for the top crust.
Whisk one egg and then brush the top and sides of the crust.
1 large egg
Bake for about 30-35 minutes until the crust is golden brown. If the edges of the crust begin to brown before the center, cover the edges with foil so they don’t burn, and allow the pie to continue baking until the center crust is done.