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1) A toaster oven which is used to cook and heat up uncovered food may only be used for one class of food, and must be designated for meat, dairy or Parve, and once it is used it cannot be changed over to another class.
The reason for this is that due to the small size of the toaster oven and the many areas that are all but impossible to reach and clean, it will never be able to be koshered properly. (See Sefer HaKashrus page 47 footnote 98, quoting several Great Poskim)
If the toaster is designated exclusively to cook foods that are in hermetically sealed containers, it may then be used for both classes of food consecutively, provided that the outside of the container is dry and absolutely free of any food particles.
Additionally, the tray on which the food is laying while being cooked must be totally clean of any food particles.
2) In cases of necessity, where no special hermetically sealed containers are available, the food can be double wrapped in aluminum foil, to the point that it is hermetically sealed.
Here too, the entire outside of the aluminum foil must be dry and free of food particles.