In a small skillet heat the oil over moderately high heat until it is hot but not smoking, in it cook the tortillas, 1 at a time, for 5 seconds, or until they are softened but not crisp, and transfer them with tongs, letting the excess oil drip off, to paper-towel-lined baking sheets to drain. On each tortilla mound 1/4 cup of the turkey, 1 tablespoon of the Cheddar, 1 tablespoon of onion, and 1 teaspoon of the chopped coriander, roll up the tortillas jelly-roll fashion, and arrange the enchiladas, seam sides down, in a shallow 3-quart baking dish.