Heat oven to 400 degrees. In 10-inch skillet over medium-high heat, cook ground beef about 5 minutes, stirring occasionally until well browned. Stir in chili powder; cook 1 minute. Remove from heat; stir in taco sauce, green chiles, and salt. In small bowl, combine corn and half of green onions. In 1 1/2-quart casserole, layer half corn mixture, half beef mixture, half olives, and half cheese. Repeat layering. Bake, covered, 20 minutes until heated through and cheese is melted. Garnish with tortilla chips, sour cream, tomato, and remaining green onions. Serve.