For the ham and cheese toast, place the toast slices side by side. Place 2 sheets of cheese on each slice of toast. Place 2 sheets of toast ham on each of 4 slices of cheese toast.
Cut tomato into thin slices. Place mayonnaise, oregano and 1 tomato slice on each of the ham. Fold cheese toast slice over top and toast in toaster oven for about 5 minutes until cheese is melted.
Serve the ham and cheese toast.