Cut zucchini in half lengthwise. Scoop out insides, leaving shells about 1/4 inch thick. Reserve about half of the insides.
Heat 2 Tbsp of olive oil in a skillet on medium high heat, and sauté onion and garlic until soft. Add reserved zucchini insides, and cook another 2 minutes. Set aside.
Fry turkey until fully cooked (drain any fat), then stir in the onion mixture. Stir in tomatoes, basil and rosemary and cook 1 minute longer. Remove from heat and set aside.
When mixture has cooled, add cheese, egg, salt and pepper.
Fill zucchini shells with mixture, and place in a baking dish with 1/4 inch of water in the bottom of the pan. Bake at 375°F for 40 minutes, until golden brown.
Notes
Can add any other veggies you like - corn, peppers, etc.