Preheat oven to 400 degrees F.
Spread the tortillas on 1 side with the butter, put them on ungreased baking sheets buttered side up, and toast them in the oven for 5 minutes, or until they are barely golden. (The tortillas may be toasted 2 hours ahead and kept covered.)
In a bowl toss together the cheese, scallions, pimiento, jalapeno peppers, cilantro, and and cumin. Sprinkle the mixture on the tortillas, and bake the quesadillas in the 400 degree F. oven for 5 to 8 minutes, or until the cheese is bubbly. Transfer the quesadillas to a cutting board and cut them into wedges.