Preheat oven to 375 degrees. Cook beef, onion and garlic in large skillet until beef is browned then drain. Stir in salsa, beans, enchilada sauce and olives. Bring to a boil. Reduce heat to low; cook, stirring frequently, for 5 to 6 minutes. Layer half of corn tortillas on bottom of greased 13 x 9-inch baking dish. Cover with half of meat sauce and sprinkle with 1 cup cheese. Repeat layers. Bake, covered, for 20 minutes. Remove cover and bake for additional 5 minutes or until bubbly and cheese is melted. Sprinkle with green onions before serving.