Preheat your oven to 350 degrees Fahrenheit (175°C) and prepare a muffin tray with nonstick spray.
Wash the apples, cut them in half lengthwise, and remove the core.
Slice the apples thinly widthwise, keeping the open side of the apple down.
Put the thinly sliced apples in a bowl and add the juice of half a lemon.
Add 1-2 teaspoons of sugar and a small pinch of cinnamon to the apples and mix until well combined. Set aside the remaining sugar and cinnamon.
Melt the butter and brush it onto one side of each puff pastry sheet.
Mix the remaining sugar and cinnamon together and spread it over the buttered puff pastry side.
Cut each puff pastry sheet into six even strips.
Place a few slices of apple along the strip of puff pastry and fold it over so that the apple slices are in between.
Gently roll up the apple and pastry into a rose shape and place it in the prepared muffin tray. Repeat until all 12 roses are rolled up.
Bake in the oven for 25-30 minutes, or until golden brown.
Allow to cool for 10 minutes before dusting with powdered sugar and serving.
