Baked apple chips take about 3 hours to make. Place a wire rack on top of a baking tray and lay the apple slices on top of the wire rack. Bake in an oven preheated to 350°F (180°C) for 3 hours until the chips are dry and crispy. They are the perfect addition to a kid's lunch box for a delicious snack at school that is nut-free and low-sugar.