Preheat oven to 250F. Line baking sheets with parchment paper. Thinly slice apples (a mandolin would work well for this) and lay in a single layer on baking sheets. Sprinkle the apple slices with cinnamon, OLiV Balsamic Vinegar & a pinch of salt (if using). Bake in the oven for 1 - 1 1/2 hours flipping slices after about 1/2 hour. Remove from oven and let sit to crisp. Makes a nice healthy snack.