Preheat the oven to 200°C/390°F. Line the baking tray with baking paper.
Dust the countertop with plain flour.
If you are using a block of puff pastry roll it out with a rolling pin into a rectangular shape until it's more or less 4 - 5 mm thick.
If using ready to roll out puff pastry, unfold it and lay it flat on the floured surface.
Cut the pastry sheet into even rectangles and place them onto a tray. Ready-rolled puff pastry 35 cm x 23cm makes 8 pcs (each around 11.5 cm x 8.5 cm).
Spread a small heap of caramel over the top of each piece. Leave approx. 1 cm border around the edges clean.
Sprinkle a few chocolate chips over the caramel.
Lay 4 - 5 apple slices over the top.
Give the pastry an egg wash along the edges.
Sprinkle the apples with caster sugar.
Bake at 200°C for 20 minutes or until the puff pastry is golden brown.
Eat the same day. These apple tarts taste best when they are fresh.