In a small bowl, combine the sour cream and 3/4 of the cheese.
Into a 9x13 inch pan, pour a small amount of enchilada sauce to coat bottom of pan. Layer 6 tortillas on bottom of pan. Layer half of the cheese-sour cream mixture and 1/3 of the olives over the tortillas. Repeat this layer once more. Pour the remaining enchilada sauce over the final layer of tortillas.
