Preheat oven to 400°F.

Combine the melted butter, sugar and cinnamon in a bowl and set aside.

Roll out each puff pastry sheet to make them a bit thinner, and cut each of the puff pastry sheets into 6 equal squares (you should have 12 in total as most packages come with 2 sheets).

Working one square at a time, gently roll in the sides to create a barrier. Using a fork, prick the bottom of the square, then brush on some of the cinnamon butter.

Arrange a few slices into the puff pastry square to create a diagonal pattern and brush the slices with a bit more of the cinnamon butter. Transfer the tart to a parchment paper lined baking tray and repeat with the remaining puff pastry squares. You may need to use 2 baking sheets.

Bake the tarts until the pastry is golden brown and the apple slices are tender, 15 to 20 minutes.

Remove from the oven and let cool at room temperature for 10 minutes.

Sprinkle with powdered sugar, a drizzle of caramel, and serve with vanilla ice cream.