This is an easy, no-bake apple pie recipe that uses only four ingredients: frozen pie crust, apples, sugar, and butter. You can even skip peeling the apples; simply layer thinly sliced ​​apples with the pie crust and bake in a toaster oven. The combination of crispy pie crust and sweet and sour apples is exquisite, and it's delicious fresh out of the oven, or sprinkled with cinnamon powder. It's an easy-to-make, authentic apple pie.