To make a single serving apple puff, simply core the apple, dice it and cook it in low flame till it softens a little. Then, sprinkle with some cinnammon powder and brown sugar. Next, spread the partially cooked apple cubes onto a slice of puff pastry sheet and place another sheet of puff pastry on top. After that, seal the edge and brush some egg wash on top of the puff pastry. Lastly, pop it into the oven and bake for 10 minutes.