Heat oven to 350 degrees F. Mix tomatoes, chili powder, cumin, salt and pepper in bowl. Mix sour cream, scallions, and chiles in second bowl.Advertisement
Spread 1/2 cup of the tomato mixture in 13 x 9 x 2-inch baking dish. Arrange 2 of the tortillas to cover bottom; use pieces from another tortilla to fit corners if needed. Top with half of the sour cream mixture, half of the chicken, half of the corn, 1 cup of the tomato mixture and one-third of the cheese. Repeat layering, ending with tortillas. Top with any remaining tomato mixture. Sprinkle remaining cheese around edge.
Bake in 350 degree F oven 35 minutes or until bubbly. Let stand 15 minutes. Garnish with olives and scallions. Makes 12 servings.