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Instructions
Preheat the oven to 350 degrees F (175 degrees C). Place butter in a large cast-iron skillet; place in oven while preheating until melted, about 5 minutes.
Stir brown sugar into melted butter in the skillet; return to oven until bubbling, about 5 minutes.
Gently place 1 pie crust on top of brown sugar mixture, without pressing down; arrange apple slices on top of crust.
Combine white sugar, cinnamon, and flour in a bowl; sprinkle over apple slices. Place remaining 1 pie crust over apple slices; cut slits in top crust for ventilation. Seal top and bottom crusts together.
Bake in the preheated oven until top crust is lightly browned, about 45 minutes.