Place butter in 10" cast iron skillet and place in oven. Melt butter.
Remove skillet and add brown sugar to butter, stir until brown sugar melts. Return to oven for a few minutes if necessary.
Place one pie crust on top of the melted butter/brown sugar mixture. Return to oven and bake for 10 minutes.
Mix together sugar, cinnamon, nutmeg and flour.
Place sliced apples in a large bowl and sprinkle with cinnamon sugar mixture.
Add apples to skillet and dot with butter.
Place second pie crust on top. Cut 3-4 slits in pie crust to allow for steam to escape.
Bake for 30-40 minutes or until apples are tender and pie crust is golden brown.
Allow pie to cool for a bit and serve warm with ice cream.
If you don't have a cast iron skillet, you could also use any 10 inch oven safe skillet or pan. A 9 x 9 inch square baking dish would also work.If the crust begins to brown too quickly, cover with a piece of foil for the remainder of the baking time.