In a medium bowl, melt butter in the microwave then mix in the cinnamon and sugar. Add thin apple slices (need to be quite thin, otherwise they won't be fully cooked at the end) to bowl and let them coat well with mixture.
Cover a baking tray with baking parchment then arrange the empanada discs on top. Distribute apple slices, one next to the other one, over the centre of empanada disc. Crimp edges of dough to the centre. Brush the apples with warmed jam.
Bake in the preheated oven for 12 to 15 minutes, or until lightly browned. Serve warm with whipped cream or ice cream.
Feel free to substitute the empanada pastry with discs of shortcrust pastry.