1. Preheat oven to 375º.
2. Cook beef, onion and garlic until beef is browned; drain. Stir in water, taco sauce, chilies, and seasoning mix. Cook over low heat for 3 to 4 minutes.
3. Layer half of broken taco shells on bottom of greased 12x8 baking dish. Cover with half of meat sauce; sprinkle with 1 cup cheese. Repeat with remaining shells, meat sauce and cheese. Bake for 20 to 25 minutes or until bubbly and cheese is melted. Top with remaining olives, tomatoes, and green onions.