Wash and dry the apples thoroughly. Using a sharp knife or a mandoline slicer, slice the apples into thin rounds (about 1/8-inch thick). Remove any seeds as needed.
In a small bowl, mix together the cinnamon, sugar, and salt.
In a separate bowl, toss the apple slices with lemon juice to prevent browning.
Lay the apple slices in a single layer on a baking sheet lined with parchment paper.
Sprinkle the cinnamon sugar mixture evenly over the apple slices, ensuring all slices have a bit of flavor.
Place the baking sheet in the preheated oven and bake for 1.5 to 2 hours, flipping the chips halfway through, until they are crisp and slightly golden.
Remove from the oven and let them cool completely, as they will continue to crisp up as they cool.
Notes
Serve in a stylish bowl with a sprinkle of cinnamon for garnish.