Grate cheese. Lightly butter one side each of 4 tortillas. Place on a griddle, & cook until warm & browned slightly. Remove 2 of them & keep warm. To each of the remaining 2, sprinkle with 1/4 of the cheese, top each one with 1/2 of the filling then sprinkle with remaining cheese over filling. Place the 2 warm tortillas on top of the filled ones.