Apple custard pie has tender apple slices baked in a simple vanilla custard and topped with a buttery streusel. It is almost like eating an apple pie with the ice cream baked right inside.
Preheat oven to 425℉ and put pie crust pastry in a 9-inch pie plate.
In a medium mixing bowl, melt ¼ cup of the butter.
Stir in the condensed milk.
Add the eggs, cinnamon, and nutmeg. Mix well.
Distribute the apple slices in the prepared pie crust and pour the custard mixture over the top.
In a small bowl, combine the flour and brown sugar. Cut in the remaining ¼ cup of butter until crumbly. If desired, you can stir in about ¼ cup of chopped nuts as well.
Sprinkle the crumb mixture over the pie.
Bake on the bottom rack of the oven for 10 minutes.
Reduce the heat to 375℉ and continue to cook for about 30-35 more minutes or until the crust and streusel are golden brown.
Cool at room temperature for an hour or two before moving the the refrigerator to chill.