Butter one side of each slice of bread. Lay slices of bread with the buttered side down in the toaster.
Top them with slices of cheddar cheese. Add a mound of macaroni and cheese.
Add another slice of bread with the buttered side up.
Cook till the bread turns golden brown and cheese melts.
Cut the sandwich diagonally and sprinkle some shredded mozzarella over it.
Serve it with tomato sauce.