Defrost the pie crusts according to the package directions.
Combine the chopped apple, lemon juice, cinnamon, sugar, and vanilla extract in a small bowl.
Pour the apple mixture into one of the prepared pie crusts.
Evenly arrange the 6 small cubes of butter over the apple mixture.
Top the pie with the other pie crust and pinch the edges closed. Make a few slits in the top of the dough.
Spread the beaten egg onto the pie crust and sprinkle on sugar.
Press Menu and use the START/PAUSE dial to select Menu Preset 58. Press START/PAUSE to begin preheating, after which the unit will beep twice, display “Ready”, countdown for 10 seconds and then beep once to give you time to insert your food.
Open the door, place the apple pie on the Wire Rack, and slide it into Position 1.
Close the door to begin cooking at 320˚F for 30 minutes, after which the unit will beep three times and display “End”.