Heat oven to 425° (F). Personally, I have an oven that smokes at anything above 400° (F) and 375° (F) works just fine.
Add apples, brown sugar, flour, nutmeg, vanilla, lemon juice and cinnamon to a mixing bowl. Mix away!
Lay the pie crust out on a baking sheet and pour apple mix onto it. Make sure to leave about 2 or 3 inches around the edge. You'll need that extra space later. If you're feeling a little fancy, try making a cute little apple spiral. It'll be worth the photo-ops in the end.
Fold a section of the crust onto the fruit. Turn the pan a quarter turn and repeat until all of the margin crust is folded onto the fruit.
Brush egg wash onto the crust and pop that baby in the oven. Bake for 30-40 minutes or until the crust is nicely brown.