Dip container of frozen mix into hot water just to loosen. In 2 litre saucepan, heat frozen mix, water, olives and chili powder to boiling. Reduce heat; cover and simmer, stirring frequently, until mix is thawed, about 20 minutes. Heat oven to 375'. Layer half each of the tortillas, meat mixture and cheese in ungreased baking dish, 11.75x 7.5x 4 cm; repeat. Bake uncovered until bubbly, 30 to 40 minutes.