Place zucchini slices in a shallow baking dish. Sprinkle with salt, garlic salt, oregano and pepper. Slice tomatoes and place over squash. Season the same as zucchini. Slice onions to form a layer and season as before. Layer cheese slices on next. Top with a layer of bacon. Bake uncovered for 45 to 55 minutes in a 350 degree oven. Randy Rigg