Creating Cinnamon Roll Apple Pie is simple when you follow these steps:

1. Preheat the Oven: Preheat your oven to 425°F (220°C).
2. Prepare the Apples: In a large bowl, combine the sliced apples with sugar, lemon juice, cinnamon, nutmeg, and cornstarch. Toss until evenly coated.
3. Prepare the Pie Crust: Place one pie crust in a 9-inch pie pan, pressing it gently against the sides.
4. Add the Apple Filling: Pour the apple mixture into the lined pie crust, spreading it evenly.
5. Roll Out the Cinnamon Rolls: Open the can of cinnamon rolls and separate them. Roll out each piece slightly to flatten.
6. Arrange the Cinnamon Rolls: Cut the cinnamon roll dough into smaller pieces or shapes and place them on top of the apple filling, covering it as evenly as possible.
7. Make the Egg Wash: In a small bowl, whisk together the egg and milk. Brush this mixture over the cinnamon roll pieces for a golden finish.
8. Bake the Pie: Place the pie in the preheated oven and bake for 45-50 minutes, or until the crust is golden and the apples are tender.
9. Cool the Pie: Remove the pie from the oven and let it cool for about 15-20 minutes before serving.
10. Drizzle with Icing: Once cooled, drizzle the icing from the cinnamon roll can over the top for added sweetness.

These steps will guide you in making this incredible pie, ensuring that you achieve a delicious result every time.