Preheat oven to 350ºF.
Core and slice apples very thin.
Combine apples with melted butter, cinnamon and brown sugar.
Heat in microwave for 30 seconds, or until apples are soft.
Roll each puff pastry sheet to the same size, evenly spread apple mixture over one sheet. Top with the second sheet.
Slice into strips and twist.
Place on baking sheet and top with melted butter (approx. 2 tbsp additional), sprinkle with cinnamon sugar.
Bake at 350ºF for 20-25 minutes or until golden brown.
Remove from oven and serve warm.