Heat the oil in a skillet and fry the tortillas til crisp, one at a time. Drain them on paper towels then spread the refried beans over each tortilla. Top two tortillas with meat and put the other two on top, bean side down. Spread the taco sauce on top of the filled tortillas and sprinkle the cheese over the top.
Broil on high,the stuffed tortillas until the cheese melts, but watch carefully not to burn them. Seed and dice the tomatoes. Sprinkle these and the chopped green onions on top of the tortillas and serve with sour cream.