Preheat oven to 375°
In a large skillet, brown ground beef with onion; remove from heat and drain off excess fat. Add chili sauce, soups, chopped chile peppers, milk, and minced garlic; mix well.
In a greased 9x13x2-inch baking pan, place a layer of half the coarsely crumbled tortilla chips; top with half of the ground beef mixture. Layer with remaining crumbled tortilla chips, then remaining meat mixture. Sprinkle cheddar cheese and chopped black olives over top. Bake at 375° for 35 to 40 minutes. Let stand for 10 minutes before serving.