Core your apple and then, using a mandoline, cut it into 1/8-inch slices. Time-saver tip: If you don't want to core the apple, you can pull out the seeds with your fingers after slicing. And if you don't have a mandoline, you can make thin slices with your knife.
Next, cover two 9x11-inch baking sheets with parchment paper and set aside.
In a small bowl, mix the spice ingredients together.
Place a few apple slices on a large plate and rub the spice mix on both sides.
Set slices in a single layer on the parchment-lined baking sheet.
Continue until all the apple slices are spiced and placed on the sheet. Place the apples in the oven and bake for one hour. Flip the slices over and bake for another hour.
Then, turn the oven off but leave the apples inside to cool - this is when they get nice and crispy.
Serve and enjoy immediately or keep in an airtight container for a few days.