Pie Filling:
6 large baking apples, peeled, cored, and sliced ½ inch thick
1 cup sugar
2 tablespoons flour
½ teaspoon cinnamon
¼ teaspoon nutmeg
1 large egg
1 cup heavy whipping cream
1 teaspoon vanilla extract
For streusel topping:
1 stick cold, unsalted butter, cubed
½ cup granulated sugar
½ cup brown sugar
½ cup flour
1 teaspoon cinnamon
½ teaspoon ground ginger
½ teaspoon kosher salt
Preheat oven to 350°F. Press pie crust into a 9-inch round baking dish. Prepare streusel topping. Combine brown sugar, granulated sugar, ½ cup flour, 1 teaspoon cinnamon, ginger, salt, and cubed butter. Mix with clean fingers until crumbly. Set aside. Mix 1 cup sugar, 2 tablespoons flour, ½ teaspoon cinnamon and ¼ teaspoon nutmeg in a bowl. Set aside. Beat egg, heavy cream, and vanilla in a large bowl until well combined. Add sugar mixture to egg mixture and whisk to combine. Evenly distribute apple slices around pie shell. Pour liquid mixture over top of apples until pie shell is ¾ full. Place pie on a baking sheet and bake for 18-20 minutes. Remove from oven and evenly spread streusel mixture over top of pie. Return sheet pan to oven and bake for an additional 45-50 minutes. Set pie on a wire rack to cool completely before slicing.