Preheat oven to 350F.
Peel & core apples. Slice into thick wedges and place in a bowl. Toss with cinnamon & sugar, set aside.
Melt butter in cast iron pan over medium heat. Add brown sugar and cook, stirring until sugar mostly melted (a few minutes). Remove from heat and set aside.
Place one of your pie crusts in cast iron pan over brown sugar mixture. Pat down a little. Pour in your apple mixture. Top with second pie crust. Whip up your egg whites a little with a fork. Brush on top of pie. Sprinkle with 1-2 tbsp sugar. Cut slits on top of pie crust.
Bake in oven for 1 hour or until golden and bubbly. Cool a little before serving. Serve with vanilla ice cream, whipping cream or a spoon.