I start by preheating my oven to 225°F. Low heat is essential because it slowly dries the apples instead of cooking them too fast. I also line my baking sheets so the apples don’t stick.
In a small bowl, I mix the sugar and cinnamon until fully combined. This ensures every apple slice gets even flavor without clumps.
I slice the apples as thinly as possible using a mandoline. Thin slices are the key to crispy apple chips and help them bake evenly from edge to center.
I lay the apple slices in a single layer on the baking sheets and sprinkle the cinnamon sugar evenly over them. Overlapping slices can trap moisture, so spacing matters.
I bake the apples for one hour, then flip each slice carefully. After flipping, I bake them for another hour until they feel dry and crisp around the edges.