Pre-heat oven to 350° (180° celsius). Line a cookie sheet with Parchment Paper.
Roll out the puff pastry, and gently roll a couple of times with a rolling pin, then fold over the edges (1/2 inch 1 1/2 cm) to form a border, brush the pastry with 1 or 2 tablespoon of milk and prick the dough with a fork.
In a small bowl mix together the cinnamon and brown sugar.
Peel and core the apples and thinly slice (not paper thin), toss with lemon juice, add the melted butter and cinnamon mixture, toss gently to coat the slices.
Line the pastry with the sliced apples, drizzle any remaining mixture in the bowl on the apples. Bake for approximately 20-25 minutes or until golden and cooked. Serve warm with a scoop of ice cream if desired. Enjoy!
Be sure to watch the Video at the top of the post!