Preheat oven to 400.
Heat an oven-proof skillet. Sauté onion in oil until wilted and pale golden. Add garlic and cook one minute longer. Transfer to a small bowl.
Crumble beef into skillet. Stir and cook until meat is no longer pink, about 8 minutes. Return onion and garlic to skillet.
Stir in chili powder, sugar, cumin, oregano, salt, pepper and cinnamon. Cook 2-3 minutes more, stirring to blend flavors.
Stir in the tomatoes, reserved tomato juice and chilies. Reduce heat to moderately low and simmer for 10 minutes, stirring occasionally. Transfer mixture to a bowl; reserve.
Wipe skillet clean with paper towels.
Place half of the chips in an even layer on the bottom of the skillet.
Spoon half of the meat sauce over them.
Sprinkle with green onion.
Reserve some of the olives for garnish and scatter the rest over the green onions. Sprinkle with half of the cheese.
Press down with spatula to compress slightly.
Top with remaining chips, press down.
Spread remaining meat sauce over top; sprinkle with remaining cheese.
Bake for 20 minutes or until hot and bubbly and cheese is melted. Remove skillet from over and let sit for 10 minutes before serving.
Garnish the top with reserved olives, additional green onions, avocado, lime and cilantro.