Naple Biscuits, or Charlotte Russe

The sponge cake shells can be baked up to 2 days ahead and stored in an airtight container at room temperature. The custard can be prepared up to 3 days ahead and refrigerated in an airtight container with plastic wrap pressed directly on the surface to prevent skin formation. Do not assemble more than 2 hours before serving to prevent soggy shells.

Once assembled, Charlotte Russe should be served within 2-3 hours for optimal texture. If necessary, filled shells can be refrigerated for up to 6 hours, covered loosely with plastic wrap, but the cake will soften considerably. Unfilled shells stay fresh at room temperature for 2 days; custard keeps refrigerated for up to 3 days separately.