Let's give it the 'Bakery treatment.

The Vapour Deposition Toast Topper is a slice-of-toast-sized device containing an element-heated topping reservoir (calibrated to hold exactly one serve worth of topping), a teflon-lined slot to house a fresh slice of toast, and a series of fine nozzles arrayed above the surface of said toast.

To begin the process, the toast is inserted into the device, where it sits beneath the nozzles. The topping, having been liquified by the heating elements in the topping reservoir, is sprayed in liquid form onto the toast, ensuring good penetration of the bread matrix and an even distribution.

Between uses, water is placed in the reservoir and flushes out both the topping-to-nozzle feed lines and the reservoir itself. This used water (with residual topping from the last application) flows out the slot for disposal.