Preheat oven to 375 degrees F.
Trim ends from zucchini and slice in half, lengthwise. Use the tip of a spoon to scrape out the zucchini flesh (see recipe note), chop it and set it aside. Place the scooped out zucchini boats into a 13- x 9-inch baking dish and add about 1-inch of water. Cover with foil and bake in preheated oven for 20 minutes, until just slightly fork-tender. Remove from oven, and set aside to cool slightly.
Combine salsa and tomato sauce in a bowl. Measure out 1 cup and reserve for later.
Meanwhile, add olive oil to a 12-inch skillet and place over MEDIUM heat. Add turkey (or beef), onion, bell pepper, and garlic to the skillet. Cook, stirring to break up the ground meat as it cooks. Continue to cook and stir until meat is thoroughly cooked and veggies have softened. Drain off as much grease as possible and return the skillet to the heat. Add the chopped zucchini flesh, diced green chiles, olives, salsa mixture (reserve 1 cup for later), taco seasoning, fresh ground black pepper, and crushed red pepper. Stir well to combine. Bring to a boil, then reduce heat and allow to simmer over low heat for about 15 minutes.
Remove partially cooked zucchini from baking dish and pour off water. Pour the 1 cup of reserved salsa mixture into the empty baking dish and place zucchini boats on top of the sauce.
Divide the filling between the zucchini boats. If you have extra filling, spoon it into the dish around the zucchini boats. Cover the dish with foil, and bake for 20 minutes, or until zucchini is fork tender. Remove dish from oven and set oven to BROIL.
Remove foil and sprinkle zucchini boats with cheese and crushed tortilla chips. Place dish in oven, watching closely, and cook for just a couple of minutes until cheese has melted and tortilla chips are golden brown.
Sprinkle with chopped cilantro and green onion and serve.
Top individual servings with sour cream, chopped tomatoes, and additional crushed tortilla chips.