Toaster is mostly used for a single purpose: to toast bread.
However, kitchen appliances do not always serve only one function. We can cool other things in the refrigerator besides food, and we can also use the toaster to toasting vegetables, for example sweet potato slices for sandwiches.
Cut a sweet potato into thicker slices and toast them. When the slices have cooled, spread them with peanut butter and jam and sprinkle with muesli.
If you would like a salty flavor, add avocado cream or a fried egg to make sandwiches.