u003cstrongu003eLeftover Ontbjitkoek: u003c/strongu003eIt will keep at room temperature for up to 1 week as well, as long as it is well wrapped in plastic wrap. This also gives it a sticky exterior, which is quite desirable in Dutch households.u003cbr/u003eu003cstrongu003eFreezing: u003c/strongu003eOntbijtkoek freezes exceptionally well.  Just seal it inside of a zip-top freezer bag and freeze for up to 1 month.  Defrost slices in the toaster, microwave, or at room temperature.