crumble beef and chorizo into a large skillet. Cook over medium heat until no longer pink. Drain well. In a greased 13 x 9" baking dish, layer the meat mixture, refried beans, chilies, cheese and taco sauce. Bake, uncovered at 400° for 20 minutes.
For guacamole, in a small bowl, mash the avocados. Stir in lemon juice and garlic salt. Cool nacho mixture for five minutes. Top with guacamole, sour cream, tomato and olives. Garnish with additional cheese. Serve with tortilla chips. Serves 30