Open and roll out your puff pastry. Using a sharp knife, cut into 12 squares. Nothing about perfection here just equal squares. Enough to get a scoop of your apple mixture into the center of your square allowing room for the pastry to puff up when you cook.
Mix your cinnamon, nut meg and sugar together, set aside.
Peel your apple and thinly (thinly) slice. Chop into smaller pieces based on your preference.
Heat your skillet over medium heat. Place your apples in the skillet and sprinkle your mixture over top. Toss well to mix and add juice of 1/2 lemon. Toss well and cook for 4-5 minutes until apples are tender. Remove from heat.
Place parchment paper onto baking sheet. (if you do not have parchment paper, make sure your spray/coat your baking sheet). Place your puff pastry square onto baking sheet and add a spoonful of your apple mixture to the center. Continue until you have all your squares completed. This may take two baking sheets.
Place in preheated oven at 400 for 15-20 minutes or until golden brown.
Remove when cooked to desired crispness. Serve with scoop of vanilla ice cream.