Easy Taco Casserole

1# ground beef
1 c onion, chopped
2 cloves garlic, minced
1/2 c gtaco sauce plus small amount water
1 (4 oz) green chilis, diced
1 (8 oz) can tomato sauce
1 c black olives, drained and sliced
1 pgk tortilla chips, broken
2 c shredded cheddar cheese
chopped tomatoes & sliced green onion for garnish

-cook beef with onion and garlic until browned; drain
-stir in water, taco sauce, chilis, tomato sauce, 1/4 c olives
-cook over low heat for 3-4 min
-layer 1/2 off chips on bottom of greased 8"x12" baking dish
-cover with 1/2 of meat suace; sprinkle with 1 c cheese
-repeat layers; chips, meat sauce, cheese
-bake @ 375º for 20-25min, until bubbly and cheese is melted
-top with rest of olives, tomatoes and green onion