*For best color, organic apple is recommended. We used a mandoline to slice apple very thinly and evenly.
Make-Ahead Tip: Tartlets without the apple slices can be prepared up to 8 hours in advance, placed in a covered container, and refrigerated until needed. Top with apple slices before serving, but no more than 2 hours in advance.
Kitchen Tip: Use a ¼-cup metal measuring cup to press graham cracker mixture into tartlet pans.